51657656 has 48 divisors (see below), whose sum is σ = 105704640. Its totient is φ = 23639040.

The previous prime is 51657649. The next prime is 51657673. The reversal of 51657656 is 65675615.

51657656 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 an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 89240 + ... + 89816.

It is an arithmetic number, because the mean of its divisors is an integer number (2202180).

Almost surely, 2^51657656 is an apocalyptic number.

It is an amenable number.

51657656 is an abundant number, since it is smaller than the sum of its proper divisors (54046984).

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

51657656 is a wasteful number, since it uses less digits than its factorization.

51657656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 629 counting only the distinct ones).

The product of its digits is 189000, while the sum is 41.

The square root of 51657656 is about 7187.3260674607. The cubic root of 51657656 is about 372.4302071846.

It can be divided in two parts, 5165 and 7656, that added together give a palindrome (12821).

The spelling of 51657656 in words is "fifty-one million, six hundred fifty-seven thousand, six hundred fifty-six".