56661504 has 80 divisors (see below), whose sum is σ = 155185008. Its totient is φ = 18358272.

The previous prime is 56661503. The next prime is 56661511. The reversal of 56661504 is 40516665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661503) 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, 56334 + ... + 57330.

Almost surely, 2^56661504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56661504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77592504).

56661504 is an abundant number, since it is smaller than the sum of its proper divisors (98523504).

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

56661504 is an equidigital number, since it uses as much as digits as its factorization.

56661504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055 (or 1039 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 56661504 is about 7527.3836091965. The cubic root of 56661504 is about 384.0867859400.

The spelling of 56661504 in words is "fifty-six million, six hundred sixty-one thousand, five hundred four".