55591272 has 120 divisors (see below), whose sum is σ = 171390450. Its totient is φ = 16822080.

The previous prime is 55591267. The next prime is 55591297. The reversal of 55591272 is 27219555.

It can be written as a sum of positive squares in only one way, i.e., 53670276 + 1920996 = 7326^2 + 1386^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 78054 + ... + 78762.

Almost surely, 2^55591272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55591272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85695225).

55591272 is an abundant number, since it is smaller than the sum of its proper divisors (115799178).

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

55591272 is a wasteful number, since it uses less digits than its factorization.

55591272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 725 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 55591272 is about 7455.9554719700. The cubic root of 55591272 is about 381.6531669127.

The spelling of 55591272 in words is "fifty-five million, five hundred ninety-one thousand, two hundred seventy-two".