51287256 has 40 divisors (see below), whose sum is σ = 143653620. Its totient is φ = 17095536.

The previous prime is 51287233. The next prime is 51287279. The reversal of 51287256 is 65278215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51287233) and next prime (51287279).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51287256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 38926 + ... + 40221.

Almost surely, 2^51287256 is an apocalyptic number.

It is an amenable number.

51287256 is an abundant number, since it is smaller than the sum of its proper divisors (92366364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51287256 is a wasteful number, since it uses less digits than its factorization.

51287256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79165 (or 79152 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 51287256 is about 7161.5121308282. The cubic root of 51287256 is about 371.5379278451.

The spelling of 51287256 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred fifty-six".