51657764 has 12 divisors (see below), whose sum is σ = 95718924. Its totient is φ = 24309504.

The previous prime is 51657757. The next prime is 51657779. The reversal of 51657764 is 46775615.

It can be written as a sum of positive squares in 2 ways, for example, as 26956864 + 24700900 = 5192^2 + 4970^2 .

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, 379769 + ... + 379904.

It is an arithmetic number, because the mean of its divisors is an integer number (7976577).

Almost surely, 2^51657764 is an apocalyptic number.

It is an amenable number.

51657764 is a deficient number, since it is larger than the sum of its proper divisors (44061160).

51657764 is a wasteful number, since it uses less digits than its factorization.

51657764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759694 (or 759692 counting only the distinct ones).

The product of its digits is 176400, while the sum is 41.

The square root of 51657764 is about 7187.3335806821. Note that the first 3 decimals coincide. The cubic root of 51657764 is about 372.4304667294.

The spelling of 51657764 in words is "fifty-one million, six hundred fifty-seven thousand, seven hundred sixty-four".