56615815 has 8 divisors (see below), whose sum is σ = 68204880. Its totient is φ = 45115392.

The previous prime is 56615813. The next prime is 56615851. The reversal of 56615815 is 51851665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56615815 - 2¹ = 56615813 is a prime.

It is a super-2 number, since 2×56615815² = 6410701016228450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56615813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20745 + ... + 23314.

It is an arithmetic number, because the mean of its divisors is an integer number (8525610).

Almost surely, 2^56615815 is an apocalyptic number.

56615815 is a deficient number, since it is larger than the sum of its proper divisors (11589065).

56615815 is a wasteful number, since it uses less digits than its factorization.

56615815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44321.

The product of its digits is 36000, while the sum is 37.

The square root of 56615815 is about 7524.3481445239. The cubic root of 56615815 is about 383.9835220613.

It can be divided in two parts, 5661 and 5815, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 56615815 in words is "fifty-six million, six hundred fifteen thousand, eight hundred fifteen".