55515432 has 48 divisors (see below), whose sum is σ = 161451360. Its totient is φ = 15861216.

The previous prime is 55515419. The next prime is 55515437. The reversal of 55515432 is 23451555.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55515432.

It is not an unprimeable number, because it can be changed into a prime (55515437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22428 + ... + 24779.

It is an arithmetic number, because the mean of its divisors is an integer number (3363570).

Almost surely, 2^55515432 is an apocalyptic number.

It is an amenable number.

55515432 is an abundant number, since it is smaller than the sum of its proper divisors (105935928).

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

55515432 is a wasteful number, since it uses less digits than its factorization.

55515432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47230 (or 47219 counting only the distinct ones).

The product of its digits is 15000, while the sum is 30.

The square root of 55515432 is about 7450.8678689130. The cubic root of 55515432 is about 381.4795320501.

Adding to 55515432 its reverse (23451555), we get a palindrome (78966987).

The spelling of 55515432 in words is "fifty-five million, five hundred fifteen thousand, four hundred thirty-two".