56728173 has 8 divisors (see below), whose sum is σ = 75703936. Its totient is φ = 37785600.

The previous prime is 56728169. The next prime is 56728183. The reversal of 56728173 is 37182765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56728173 - 2² = 56728169 is a prime.

It is a super-2 number, since 2×56728173² = 6436171223835858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56728153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3988 + ... + 11373.

It is an arithmetic number, because the mean of its divisors is an integer number (9462992).

Almost surely, 2^56728173 is an apocalyptic number.

It is an amenable number.

56728173 is a deficient number, since it is larger than the sum of its proper divisors (18975763).

56728173 is a wasteful number, since it uses less digits than its factorization.

56728173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16595.

The product of its digits is 70560, while the sum is 39.

The square root of 56728173 is about 7531.8107384612. The cubic root of 56728173 is about 384.2373681612.

The spelling of 56728173 in words is "fifty-six million, seven hundred twenty-eight thousand, one hundred seventy-three".