55144224 has 36 divisors (see below), whose sum is σ = 156817206. Its totient is φ = 18381312.

The previous prime is 55144211. The next prime is 55144237. The reversal of 55144224 is 42244155.

It is an interprime number because it is at equal distance from previous prime (55144211) and next prime (55144237).

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 13927824 = 6420^2 + 3732^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95449 + ... + 96024.

Almost surely, 2^55144224 is an apocalyptic number.

It is an amenable number.

55144224 is an abundant number, since it is smaller than the sum of its proper divisors (101672982).

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

55144224 is a wasteful number, since it uses less digits than its factorization.

55144224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191489 (or 191478 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 55144224 is about 7425.9157011105. The cubic root of 55144224 is about 380.6273662564.

Adding to 55144224 its reverse (42244155), we get a palindrome (97388379).

The spelling of 55144224 in words is "fifty-five million, one hundred forty-four thousand, two hundred twenty-four".