56640971 has 4 divisors (see below), whose sum is σ = 57048600. Its totient is φ = 56233344.

The previous prime is 56640953. The next prime is 56640977. The reversal of 56640971 is 17904665.

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

It is a cyclic number.

It is not a de Polignac number, because 56640971 - 2⁶ = 56640907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56640977) 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, 203606 + ... + 203883.

It is an arithmetic number, because the mean of its divisors is an integer number (14262150).

Almost surely, 2^56640971 is an apocalyptic number.

56640971 is a deficient number, since it is larger than the sum of its proper divisors (407629).

56640971 is a wasteful number, since it uses less digits than its factorization.

56640971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407628.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 56640971 is about 7526.0195986989. The cubic root of 56640971 is about 384.0403852021.

The spelling of 56640971 in words is "fifty-six million, six hundred forty thousand, nine hundred seventy-one".