56172218 has 16 divisors (see below), whose sum is σ = 86266944. Its totient is φ = 27424320.

The previous prime is 56172203. The next prime is 56172223. The reversal of 56172218 is 81227165.

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, 13346 + ... + 17042.

It is an arithmetic number, because the mean of its divisors is an integer number (5391684).

Almost surely, 2^56172218 is an apocalyptic number.

56172218 is a deficient number, since it is larger than the sum of its proper divisors (30094726).

56172218 is a wasteful number, since it uses less digits than its factorization.

56172218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877.

The product of its digits is 6720, while the sum is 32.

The square root of 56172218 is about 7494.8127394886. The cubic root of 56172218 is about 382.9780270851.

The spelling of 56172218 in words is "fifty-six million, one hundred seventy-two thousand, two hundred eighteen".