56672561 has 4 divisors (see below), whose sum is σ = 61824624. Its totient is φ = 51520500.

The previous prime is 56672549. The next prime is 56672563. The reversal of 56672561 is 16527665.

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 a cyclic number.

It is not a de Polignac number, because 56672561 - 2¹⁴ = 56656177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56672563) 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, 2576015 + ... + 2576036.

It is an arithmetic number, because the mean of its divisors is an integer number (15456156).

Almost surely, 2^56672561 is an apocalyptic number.

It is an amenable number.

56672561 is a deficient number, since it is larger than the sum of its proper divisors (5152063).

56672561 is a wasteful number, since it uses less digits than its factorization.

56672561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152062.

The product of its digits is 75600, while the sum is 38.

The square root of 56672561 is about 7528.1180251109. The cubic root of 56672561 is about 384.1117680477. Note that the first 3 decimals are identical.

Subtracting from 56672561 its reverse (16527665), we obtain a square (40144896 = 6336²).

It can be divided in two parts, 5667 and 2561, that added together give a palindrome (8228).

The spelling of 56672561 in words is "fifty-six million, six hundred seventy-two thousand, five hundred sixty-one".