55231616 has 32 divisors (see below), whose sum is σ = 120037680. Its totient is φ = 25104640.

The previous prime is 55231601. The next prime is 55231619. The reversal of 55231616 is 61613255.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (55231619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18206 + ... + 21021.

Almost surely, 2^55231616 is an apocalyptic number.

It is an amenable number.

55231616 is an abundant number, since it is smaller than the sum of its proper divisors (64806064).

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

55231616 is a wasteful number, since it uses less digits than its factorization.

55231616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39252 (or 39240 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 55231616 is about 7431.7976291070. The cubic root of 55231616 is about 380.8283315785.

The spelling of 55231616 in words is "fifty-five million, two hundred thirty-one thousand, six hundred sixteen".