56615440 has 160 divisors (see below), whose sum is σ = 168203520. Its totient is φ = 17252352.

The previous prime is 56615431. The next prime is 56615473. The reversal of 56615440 is 4451665.

56615440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180724 + ... + 181036.

It is an arithmetic number, because the mean of its divisors is an integer number (1051272).

Almost surely, 2^56615440 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 56615440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84101760).

56615440 is an abundant number, since it is smaller than the sum of its proper divisors (111588080).

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

56615440 is a wasteful number, since it uses less digits than its factorization.

56615440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 56615440 is about 7524.3232253805. The cubic root of 56615440 is about 383.9826742762.

The spelling of 56615440 in words is "fifty-six million, six hundred fifteen thousand, four hundred forty".