Having or bearing an even number.

(fluid mechanics, meteorology) A dimensionless number expressing the ratio of buoyancy to flow shear in a fluid flow.

the number of particles per unit volume

plural of Goldbach number

(mathematics) A positive even integer that can be expressed as the sum of two odd primes; involved in Goldbach's conjecture.

(mathematics) A positive integer which is divisible by the sum of all of its digits.

plural of Harshad number

plural of square number

(mathematics) Any integer which is the product of some integer with the integer itself.

(mathematics) A positive integer that is divisible by every one of its digits.