56661040 has 40 divisors (see below), whose sum is σ = 138674160. Its totient is φ = 21470976.

The previous prime is 56661019. The next prime is 56661043. The reversal of 56661040 is 4016665.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (56661043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17119 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (3466854).

Almost surely, 2^56661040 is an apocalyptic number.

It is an amenable number.

56661040 is an abundant number, since it is smaller than the sum of its proper divisors (82013120).

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

56661040 is a wasteful number, since it uses less digits than its factorization.

56661040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37309 (or 37303 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 56661040 is about 7527.3527883314. The cubic root of 56661040 is about 384.0857375106.

The spelling of 56661040 in words is "fifty-six million, six hundred sixty-one thousand, forty".