56478990 has 32 divisors (see below), whose sum is σ = 137577600. Its totient is φ = 14835744.

The previous prime is 56478977. The next prime is 56478991. The reversal of 56478990 is 9987465.

It is a super-2 number, since 2×56478990² = 6379752622840200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56478991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12040 + ... + 16059.

It is an arithmetic number, because the mean of its divisors is an integer number (4299300).

Almost surely, 2^56478990 is an apocalyptic number.

56478990 is an abundant number, since it is smaller than the sum of its proper divisors (81098610).

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

56478990 is a wasteful number, since it uses less digits than its factorization.

56478990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28176.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 56478990 is about 7515.2504948272. The cubic root of 56478990 is about 383.6739446867.

The spelling of 56478990 in words is "fifty-six million, four hundred seventy-eight thousand, nine hundred ninety".