56672661 has 4 divisors (see below), whose sum is σ = 75563552. Its totient is φ = 37781772.

The previous prime is 56672639. The next prime is 56672669. The reversal of 56672661 is 16627665.

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 56672661 - 2⁷ = 56672533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56672669) 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 3 ways as a sum of consecutive naturals, for example, 9445441 + ... + 9445446.

It is an arithmetic number, because the mean of its divisors is an integer number (18890888).

Almost surely, 2^56672661 is an apocalyptic number.

It is an amenable number.

56672661 is a deficient number, since it is larger than the sum of its proper divisors (18890891).

56672661 is a wasteful number, since it uses less digits than its factorization.

56672661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18890890.

The product of its digits is 90720, while the sum is 39.

The square root of 56672661 is about 7528.1246668742. The cubic root of 56672661 is about 384.1119939721. Note that the first 3 decimals are identical.

The spelling of 56672661 in words is "fifty-six million, six hundred seventy-two thousand, six hundred sixty-one".