56561790 has 16 divisors (see below), whose sum is σ = 135748368. Its totient is φ = 15083136.

The previous prime is 56561779. The next prime is 56561801. The reversal of 56561790 is 9716565.

It is an interprime number because it is at equal distance from previous prime (56561779) and next prime (56561801).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942667 + ... + 942726.

It is an arithmetic number, because the mean of its divisors is an integer number (8484273).

Almost surely, 2^56561790 is an apocalyptic number.

56561790 is an abundant number, since it is smaller than the sum of its proper divisors (79186578).

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

56561790 is a wasteful number, since it uses less digits than its factorization.

56561790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885403.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 56561790 is about 7520.7572757004. The cubic root of 56561790 is about 383.8613458829.

The spelling of 56561790 in words is "fifty-six million, five hundred sixty-one thousand, seven hundred ninety".