56637440 has 48 divisors (see below), whose sum is σ = 135921240. Its totient is φ = 22650880.

The previous prime is 56637437. The next prime is 56637479. The reversal of 56637440 is 4473665.

It is a self number, because there is not a number n which added to its sum of digits gives 56637440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7475 + ... + 13005.

Almost surely, 2^56637440 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 56637440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67960620).

56637440 is an abundant number, since it is smaller than the sum of its proper divisors (79283800).

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

56637440 is an equidigital number, since it uses as much as digits as its factorization.

56637440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558 (or 5538 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 56637440 is about 7525.7850088878. The cubic root of 56637440 is about 384.0324046728.

The spelling of 56637440 in words is "fifty-six million, six hundred thirty-seven thousand, four hundred forty".