51656628 has 12 divisors (see below), whose sum is σ = 120532160. Its totient is φ = 17218872.

The previous prime is 51656623. The next prime is 51656641. The reversal of 51656628 is 82665615.

51656628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152348 + ... + 2152371.

Almost surely, 2^51656628 is an apocalyptic number.

It is an amenable number.

51656628 is an abundant number, since it is smaller than the sum of its proper divisors (68875532).

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

51656628 is a wasteful number, since it uses less digits than its factorization.

51656628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304726 (or 4304724 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 51656628 is about 7187.2545523308. The cubic root of 51656628 is about 372.4277366841.

The spelling of 51656628 in words is "fifty-one million, six hundred fifty-six thousand, six hundred twenty-eight".