56772921 has 4 divisors (see below), whose sum is σ = 75697232. Its totient is φ = 37848612.

The previous prime is 56772917. The next prime is 56772941. The reversal of 56772921 is 12927765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 56772921 - 2² = 56772917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56772921.

It is not an unprimeable number, because it can be changed into a prime (56772941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9462151 + ... + 9462156.

It is an arithmetic number, because the mean of its divisors is an integer number (18924308).

Almost surely, 2^56772921 is an apocalyptic number.

It is an amenable number.

56772921 is a deficient number, since it is larger than the sum of its proper divisors (18924311).

56772921 is a wasteful number, since it uses less digits than its factorization.

56772921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18924310.

The product of its digits is 52920, while the sum is 39.

The square root of 56772921 is about 7534.7807532801. The cubic root of 56772921 is about 384.3383722650.

The spelling of 56772921 in words is "fifty-six million, seven hundred seventy-two thousand, nine hundred twenty-one".