56728770 has 128 divisors (see below), whose sum is σ = 164160000. Its totient is φ = 12531456.

The previous prime is 56728759. The next prime is 56728783. The reversal of 56728770 is 7782765.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 380656 + ... + 380804.

It is an arithmetic number, because the mean of its divisors is an integer number (1282500).

Almost surely, 2^56728770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56728770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82080000).

56728770 is an abundant number, since it is smaller than the sum of its proper divisors (107431230).

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

56728770 is a wasteful number, since it uses less digits than its factorization.

56728770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 56728770 is about 7531.8503702609. The cubic root of 56728770 is about 384.2387160447.

The spelling of 56728770 in words is "fifty-six million, seven hundred twenty-eight thousand, seven hundred seventy".