56657731 has 4 divisors (see below), whose sum is σ = 61016032. Its totient is φ = 52299432.

The previous prime is 56657729. The next prime is 56657743. The reversal of 56657731 is 13775665.

It is a happy number.

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 56657731 - 2¹ = 56657729 is a prime.

It is a super-2 number, since 2×56657731² = 6420196964136722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56657761) 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, 2179131 + ... + 2179156.

It is an arithmetic number, because the mean of its divisors is an integer number (15254008).

Almost surely, 2^56657731 is an apocalyptic number.

56657731 is a deficient number, since it is larger than the sum of its proper divisors (4358301).

56657731 is a wasteful number, since it uses less digits than its factorization.

56657731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358300.

The product of its digits is 132300, while the sum is 40.

The square root of 56657731 is about 7527.1329867354. The cubic root of 56657731 is about 384.0782605068.

The spelling of 56657731 in words is "fifty-six million, six hundred fifty-seven thousand, seven hundred thirty-one".