56505290 has 16 divisors (see below), whose sum is σ = 104459112. Its totient is φ = 21991104.

The previous prime is 56505283. The next prime is 56505329. The reversal of 56505290 is 9250565.

It is a Cunningham number, because it is equal to 7517²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 56505289 + 1 = 7517^2 + 1^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Curzon 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, 75989 + ... + 76728.

Almost surely, 2^56505290 is an apocalyptic number.

56505290 is a deficient number, since it is larger than the sum of its proper divisors (47953822).

56505290 is a wasteful number, since it uses less digits than its factorization.

56505290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152761.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 56505290 is about 7517.0000665159. Note that the first 4 decimals coincide. The cubic root of 56505290 is about 383.7334893001.

The spelling of 56505290 in words is "fifty-six million, five hundred five thousand, two hundred ninety".