55228272 has 120 divisors (see below), whose sum is σ = 161687568. Its totient is φ = 16220160.

The previous prime is 55228253. The next prime is 55228319. The reversal of 55228272 is 27282255.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214768 + ... + 215024.

Almost surely, 2^55228272 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 55228272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80843784).

55228272 is an abundant number, since it is smaller than the sum of its proper divisors (106459296).

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

55228272 is a wasteful number, since it uses less digits than its factorization.

55228272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 310 counting only the distinct ones).

The product of its digits is 22400, while the sum is 33.

The square root of 55228272 is about 7431.5726464861. The cubic root of 55228272 is about 380.8206456688.

The spelling of 55228272 in words is "fifty-five million, two hundred twenty-eight thousand, two hundred seventy-two".