56406978 has 12 divisors (see below), whose sum is σ = 122215158. Its totient is φ = 18802320.

The previous prime is 56406967. The next prime is 56406989. The reversal of 56406978 is 87960465.

It is an interprime number because it is at equal distance from previous prime (56406967) and next prime (56406989).

It can be written as a sum of positive squares in only one way, i.e., 32524209 + 23882769 = 5703^2 + 4887^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1566843 + ... + 1566878.

Almost surely, 2^56406978 is an apocalyptic number.

56406978 is an abundant number, since it is smaller than the sum of its proper divisors (65808180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56406978 is a wasteful number, since it uses less digits than its factorization.

56406978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133729 (or 3133726 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 56406978 is about 7510.4579088096. The cubic root of 56406978 is about 383.5108109915.

The spelling of 56406978 in words is "fifty-six million, four hundred six thousand, nine hundred seventy-eight".