51722664 has 32 divisors (see below), whose sum is σ = 147779520. Its totient is φ = 14777856.

The previous prime is 51722639. The next prime is 51722677. The reversal of 51722664 is 46622715.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153769 + ... + 154104.

It is an arithmetic number, because the mean of its divisors is an integer number (4618110).

Almost surely, 2^51722664 is an apocalyptic number.

It is an amenable number.

51722664 is an abundant number, since it is smaller than the sum of its proper divisors (96056856).

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

51722664 is a wasteful number, since it uses less digits than its factorization.

51722664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307889 (or 307885 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 51722664 is about 7191.8470506540. The cubic root of 51722664 is about 372.5863685740.

The spelling of 51722664 in words is "fifty-one million, seven hundred twenty-two thousand, six hundred sixty-four".