56624681 has 4 divisors (see below), whose sum is σ = 56941200. Its totient is φ = 56308164.

The previous prime is 56624663. The next prime is 56624717. The reversal of 56624681 is 18642665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18642665 = 5 ⋅3728533.

It is a cyclic number.

It is not a de Polignac number, because 56624681 - 2¹⁴ = 56608297 is a prime.

It is a super-2 number, since 2×56624681² = 6412708996703522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56624641) 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, 157991 + ... + 158348.

It is an arithmetic number, because the mean of its divisors is an integer number (14235300).

Almost surely, 2^56624681 is an apocalyptic number.

It is an amenable number.

56624681 is a deficient number, since it is larger than the sum of its proper divisors (316519).

56624681 is a wasteful number, since it uses less digits than its factorization.

56624681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316518.

The product of its digits is 69120, while the sum is 38.

The square root of 56624681 is about 7524.9372754861. The cubic root of 56624681 is about 384.0035648721.

The spelling of 56624681 in words is "fifty-six million, six hundred twenty-four thousand, six hundred eighty-one".