56178861 has 4 divisors (see below), whose sum is σ = 74905152. Its totient is φ = 37452572.

The previous prime is 56178853. The next prime is 56178893. The reversal of 56178861 is 16887165.

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.

It is a cyclic number.

It is not a de Polignac number, because 56178861 - 2³ = 56178853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56178061) 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, 9363141 + ... + 9363146.

It is an arithmetic number, because the mean of its divisors is an integer number (18726288).

Almost surely, 2^56178861 is an apocalyptic number.

It is an amenable number.

56178861 is a deficient number, since it is larger than the sum of its proper divisors (18726291).

56178861 is a wasteful number, since it uses less digits than its factorization.

56178861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18726290.

The product of its digits is 80640, while the sum is 42.

The square root of 56178861 is about 7495.2558995674. The cubic root of 56178861 is about 382.9931236509.

The spelling of 56178861 in words is "fifty-six million, one hundred seventy-eight thousand, eight hundred sixty-one".