55172216 has 32 divisors (see below), whose sum is σ = 117763200. Its totient is φ = 23987040.

The previous prime is 55172179. The next prime is 55172231. The reversal of 55172216 is 61227155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11606 + ... + 15653.

It is an arithmetic number, because the mean of its divisors is an integer number (3680100).

Almost surely, 2^55172216 is an apocalyptic number.

It is an amenable number.

55172216 is an abundant number, since it is smaller than the sum of its proper divisors (62590984).

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

55172216 is a wasteful number, since it uses less digits than its factorization.

55172216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27299 (or 27295 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 55172216 is about 7427.8002127144. The cubic root of 55172216 is about 380.6917593344.

It can be divided in two parts, 55 and 172216, that added together give a palindrome (172271).

The spelling of 55172216 in words is "fifty-five million, one hundred seventy-two thousand, two hundred sixteen".