56401778 has 8 divisors (see below), whose sum is σ = 84695772. Its totient is φ = 28169856.

The previous prime is 56401769. The next prime is 56401783. The reversal of 56401778 is 87710465.

It can be written as a sum of positive squares in 2 ways, for example, as 37540129 + 18861649 = 6127^2 + 4343^2 .

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

It is a super-2 number, since 2×56401778² = 6362321123122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13175 + ... + 16922.

Almost surely, 2^56401778 is an apocalyptic number.

56401778 is a deficient number, since it is larger than the sum of its proper divisors (28293994).

56401778 is a wasteful number, since it uses less digits than its factorization.

56401778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31036.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 56401778 is about 7510.1117168788. Note that the first 3 decimals coincide. The cubic root of 56401778 is about 383.4990257031.

The spelling of 56401778 in words is "fifty-six million, four hundred one thousand, seven hundred seventy-eight".