56178781 has 8 divisors (see below), whose sum is σ = 57353184. Its totient is φ = 55008720.

The previous prime is 56178757. The next prime is 56178817. The reversal of 56178781 is 18787165.

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 56178781 - 2⁷ = 56178653 is a prime.

It is a super-2 number, since 2×56178781² = 6312110869291922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56178701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42330 + ... + 43636.

It is an arithmetic number, because the mean of its divisors is an integer number (7169148).

Almost surely, 2^56178781 is an apocalyptic number.

It is an amenable number.

56178781 is a deficient number, since it is larger than the sum of its proper divisors (1174403).

56178781 is a wasteful number, since it uses less digits than its factorization.

56178781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171.

The product of its digits is 94080, while the sum is 43.

The square root of 56178781 is about 7495.2505628565. The cubic root of 56178781 is about 382.9929418538.

The spelling of 56178781 in words is "fifty-six million, one hundred seventy-eight thousand, seven hundred eighty-one".