56991984 has 80 divisors (see below), whose sum is σ = 170703360. Its totient is φ = 16047360.

The previous prime is 56991983. The next prime is 56991997. The reversal of 56991984 is 48919965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56991983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22662 + ... + 25050.

It is an arithmetic number, because the mean of its divisors is an integer number (2133792).

Almost surely, 2^56991984 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 56991984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85351680).

56991984 is an abundant number, since it is smaller than the sum of its proper divisors (113711376).

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

56991984 is a wasteful number, since it uses less digits than its factorization.

56991984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478 (or 2472 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 56991984 is about 7549.3035440364. The cubic root of 56991984 is about 384.8320715889.

It can be divided in two parts, 56991 and 984, that added together give a palindrome (57975).

The spelling of 56991984 in words is "fifty-six million, nine hundred ninety-one thousand, nine hundred eighty-four".