56672721 has 24 divisors (see below), whose sum is σ = 95095104. Its totient is φ = 31851360.

The previous prime is 56672689. The next prime is 56672723. The reversal of 56672721 is 12727665.

56672721 is a `hidden beast` number, since 566 + 72 + 7 + 21 = 666.

It is not a de Polignac number, because 56672721 - 2⁵ = 56672689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56672723) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3531 + ... + 11216.

It is an arithmetic number, because the mean of its divisors is an integer number (3962296).

Almost surely, 2^56672721 is an apocalyptic number.

It is an amenable number.

56672721 is a deficient number, since it is larger than the sum of its proper divisors (38422383).

56672721 is a wasteful number, since it uses less digits than its factorization.

56672721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14821 (or 14818 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 56672721 is about 7528.1286519294. The cubic root of 56672721 is about 384.1121295267.

The spelling of 56672721 in words is "fifty-six million, six hundred seventy-two thousand, seven hundred twenty-one".