56722973 has 4 divisors (see below), whose sum is σ = 56741340. Its totient is φ = 56704608.

The previous prime is 56722969. The next prime is 56722997. The reversal of 56722973 is 37922765.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 39400729 = 4162^2 + 6277^2 .

It is a cyclic number.

It is not a de Polignac number, because 56722973 - 2² = 56722969 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 56722973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56722903) 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, 3290 + ... + 11147.

It is an arithmetic number, because the mean of its divisors is an integer number (14185335).

Almost surely, 2^56722973 is an apocalyptic number.

It is an amenable number.

56722973 is a deficient number, since it is larger than the sum of its proper divisors (18367).

56722973 is a wasteful number, since it uses less digits than its factorization.

56722973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366.

The product of its digits is 158760, while the sum is 41.

The square root of 56722973 is about 7531.4655280364. The cubic root of 56722973 is about 384.2256274026.

The spelling of 56722973 in words is "fifty-six million, seven hundred twenty-two thousand, nine hundred seventy-three".