56215729 has 4 divisors (see below), whose sum is σ = 56280420. Its totient is φ = 56151040.

The previous prime is 56215721. The next prime is 56215751. The reversal of 56215729 is 92751265.

56215729 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 can be written as a sum of positive squares in 2 ways, for example, as 3508129 + 52707600 = 1873^2 + 7260^2 .

It is a cyclic number.

It is not a de Polignac number, because 56215729 - 2³ = 56215721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56215721) 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, 31024 + ... + 32785.

It is an arithmetic number, because the mean of its divisors is an integer number (14070105).

Almost surely, 2^56215729 is an apocalyptic number.

It is an amenable number.

56215729 is a deficient number, since it is larger than the sum of its proper divisors (64691).

56215729 is an equidigital number, since it uses as much as digits as its factorization.

56215729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64690.

The product of its digits is 37800, while the sum is 37.

The square root of 56215729 is about 7497.7149185602. The cubic root of 56215729 is about 383.0768864905.

The spelling of 56215729 in words is "fifty-six million, two hundred fifteen thousand, seven hundred twenty-nine".