55217372 has 12 divisors (see below), whose sum is σ = 110434800. Its totient is φ = 23664576.

The previous prime is 55217353. The next prime is 55217387. The reversal of 55217372 is 27371255.

55217372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

55217372 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985997 + ... + 986052.

It is an arithmetic number, because the mean of its divisors is an integer number (9202900).

Almost surely, 2^55217372 is an apocalyptic number.

It is an amenable number.

55217372 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55217372 is a wasteful number, since it uses less digits than its factorization.

55217372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972060 (or 1972058 counting only the distinct ones).

The product of its digits is 14700, while the sum is 32.

The square root of 55217372 is about 7430.8392527359. The cubic root of 55217372 is about 380.7955907588.

The spelling of 55217372 in words is "fifty-five million, two hundred seventeen thousand, three hundred seventy-two".