51531664 has 20 divisors (see below), whose sum is σ = 99953920. Its totient is φ = 25737120.

The previous prime is 51531659. The next prime is 51531679. The reversal of 51531664 is 46613515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27229 + ... + 29059.

It is an arithmetic number, because the mean of its divisors is an integer number (4997696).

Almost surely, 2^51531664 is an apocalyptic number.

It is an amenable number.

51531664 is a deficient number, since it is larger than the sum of its proper divisors (48422256).

51531664 is a wasteful number, since it uses less digits than its factorization.

51531664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598 (or 3592 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 51531664 is about 7178.5558436220. Note that the first 3 decimals coincide. The cubic root of 51531664 is about 372.1271773896.

The spelling of 51531664 in words is "fifty-one million, five hundred thirty-one thousand, six hundred sixty-four".