56181720 has 64 divisors (see below), whose sum is σ = 192625920. Its totient is φ = 12841344.

The previous prime is 56181707. The next prime is 56181731. The reversal of 56181720 is 2718165.

56181720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32602 + ... + 34281.

It is an arithmetic number, because the mean of its divisors is an integer number (3009780).

Almost surely, 2^56181720 is an apocalyptic number.

It is an amenable number.

56181720 is an abundant number, since it is smaller than the sum of its proper divisors (136444200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56181720 is a wasteful number, since it uses less digits than its factorization.

56181720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66904 (or 66900 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 56181720 is about 7495.4466177807. The cubic root of 56181720 is about 382.9996205120. Note that the first 3 decimals are identical.

Adding to 56181720 its reverse (2718165), we get a palindrome (58899885).

The spelling of 56181720 in words is "fifty-six million, one hundred eighty-one thousand, seven hundred twenty".