51356656 has 20 divisors (see below), whose sum is σ = 107158072. Its totient is φ = 23702976.

The previous prime is 51356633. The next prime is 51356687. The reversal of 51356656 is 65665315.

It is a happy number.

It is a super-2 number, since 2×51356656² = 5275012231004672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123246 + ... + 123661.

Almost surely, 2^51356656 is an apocalyptic number.

It is an amenable number.

51356656 is an abundant number, since it is smaller than the sum of its proper divisors (55801416).

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

51356656 is a wasteful number, since it uses less digits than its factorization.

51356656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246928 (or 246922 counting only the distinct ones).

The product of its digits is 81000, while the sum is 37.

The square root of 51356656 is about 7166.3558382207. The cubic root of 51356656 is about 371.7054360633.

The spelling of 51356656 in words is "fifty-one million, three hundred fifty-six thousand, six hundred fifty-six".