56387731 has 4 divisors (see below), whose sum is σ = 56733832. Its totient is φ = 56041632.

The previous prime is 56387719. The next prime is 56387753. The reversal of 56387731 is 13778365.

56387731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 56387731 - 2⁵ = 56387699 is a prime.

It is a super-2 number, since 2×56387731² = 6359152414656722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56387711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172806 + ... + 173131.

It is an arithmetic number, because the mean of its divisors is an integer number (14183458).

Almost surely, 2^56387731 is an apocalyptic number.

56387731 is a deficient number, since it is larger than the sum of its proper divisors (346101).

56387731 is a wasteful number, since it uses less digits than its factorization.

56387731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346100.

The product of its digits is 105840, while the sum is 40.

The square root of 56387731 is about 7509.1764528475. The cubic root of 56387731 is about 383.4671859380.

The spelling of 56387731 in words is "fifty-six million, three hundred eighty-seven thousand, seven hundred thirty-one".