56257691 has 4 divisors (see below), whose sum is σ = 64294512. Its totient is φ = 48220872.

The previous prime is 56257687. The next prime is 56257757. The reversal of 56257691 is 19675265.

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

It is not a de Polignac number, because 56257691 - 2² = 56257687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56257601) 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, 4018400 + ... + 4018413.

It is an arithmetic number, because the mean of its divisors is an integer number (16073628).

Almost surely, 2^56257691 is an apocalyptic number.

56257691 is a deficient number, since it is larger than the sum of its proper divisors (8036821).

56257691 is an equidigital number, since it uses as much as digits as its factorization.

56257691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8036820.

The product of its digits is 113400, while the sum is 41.

The square root of 56257691 is about 7500.5127158082. The cubic root of 56257691 is about 383.1721781738.

The spelling of 56257691 in words is "fifty-six million, two hundred fifty-seven thousand, six hundred ninety-one".