55531332 has 36 divisors (see below), whose sum is σ = 145572336. Its totient is φ = 18510120.

The previous prime is 55531321. The next prime is 55531351. The reversal of 55531332 is 23313555.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55531296 and 55531305.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27594 + ... + 29537.

It is an arithmetic number, because the mean of its divisors is an integer number (4043676).

Almost surely, 2^55531332 is an apocalyptic number.

It is an amenable number.

55531332 is an abundant number, since it is smaller than the sum of its proper divisors (90041004).

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

55531332 is a wasteful number, since it uses less digits than its factorization.

55531332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57150 (or 57136 counting only the distinct ones).

The product of its digits is 6750, while the sum is 27.

The square root of 55531332 is about 7451.9347823233. The cubic root of 55531332 is about 381.5159480240.

Adding to 55531332 its reverse (23313555), we get a palindrome (78844887).

The spelling of 55531332 in words is "fifty-five million, five hundred thirty-one thousand, three hundred thirty-two".