55640832 has 72 divisors (see below), whose sum is σ = 159505584. Its totient is φ = 17117184.

The previous prime is 55640801. The next prime is 55640857. The reversal of 55640832 is 23804655.

It is a junction number, because it is equal to n+sod(n) for n = 55640793 and 55640802.

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 7 ways as a sum of consecutive naturals, for example, 7198 + ... + 12770.

Almost surely, 2^55640832 is an apocalyptic number.

55640832 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55640832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79752792).

55640832 is an abundant number, since it is smaller than the sum of its proper divisors (103864752).

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

55640832 is a wasteful number, since it uses less digits than its factorization.

55640832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605 (or 5591 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 55640832 is about 7459.2782492678. The cubic root of 55640832 is about 381.7665486972.

The spelling of 55640832 in words is "fifty-five million, six hundred forty thousand, eight hundred thirty-two".