56991744 has 84 divisors (see below), whose sum is σ = 164845746. Its totient is φ = 18972672.

The previous prime is 56991743. The next prime is 56991749. The reversal of 56991744 is 44719965.

It can be written as a sum of positive squares in only one way, i.e., 56070144 + 921600 = 7488^2 + 960^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 56991744.

It is not an unprimeable number, because it can be changed into a prime (56991743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73342 + ... + 74114.

Almost surely, 2^56991744 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 56991744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82422873).

56991744 is an abundant number, since it is smaller than the sum of its proper divisors (107854002).

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

56991744 is an equidigital number, since it uses as much as digits as its factorization.

56991744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 778 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 56991744 is about 7549.2876485136. The cubic root of 56991744 is about 384.8315313970.

The spelling of 56991744 in words is "fifty-six million, nine hundred ninety-one thousand, seven hundred forty-four".