56731728 has 20 divisors (see below), whose sum is σ = 146557088. Its totient is φ = 18910560.

The previous prime is 56731699. The next prime is 56731729. The reversal of 56731728 is 82713765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56731729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590908 + ... + 591003.

Almost surely, 2^56731728 is an apocalyptic number.

It is an amenable number.

56731728 is an abundant number, since it is smaller than the sum of its proper divisors (89825360).

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

56731728 is a wasteful number, since it uses less digits than its factorization.

56731728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181922 (or 1181916 counting only the distinct ones).

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

The square root of 56731728 is about 7532.0467337902. The cubic root of 56731728 is about 384.2453943631.

The spelling of 56731728 in words is "fifty-six million, seven hundred thirty-one thousand, seven hundred twenty-eight".