51707656 has 96 divisors (see below), whose sum is σ = 131382720. Its totient is φ = 18564480.

The previous prime is 51707651. The next prime is 51707671. The reversal of 51707656 is 65670715.

51707656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51707651) 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 23 ways as a sum of consecutive naturals, for example, 87795 + ... + 88381.

It is an arithmetic number, because the mean of its divisors is an integer number (1368570).

Almost surely, 2^51707656 is an apocalyptic number.

51707656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51707656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65691360).

51707656 is an abundant number, since it is smaller than the sum of its proper divisors (79675064).

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

51707656 is a wasteful number, since it uses less digits than its factorization.

51707656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 51707656 is about 7190.8035712290. The cubic root of 51707656 is about 372.5503281698.

It can be divided in two parts, 51 and 707656, that added together give a palindrome (707707).

The spelling of 51707656 in words is "fifty-one million, seven hundred seven thousand, six hundred fifty-six".