56671720 has 64 divisors (see below), whose sum is σ = 150451200. Its totient is φ = 18800640.

The previous prime is 56671709. The next prime is 56671739. The reversal of 56671720 is 2717665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5416 + ... + 11944.

It is an arithmetic number, because the mean of its divisors is an integer number (2350800).

Almost surely, 2^56671720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56671720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75225600).

56671720 is an abundant number, since it is smaller than the sum of its proper divisors (93779480).

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

56671720 is a wasteful number, since it uses less digits than its factorization.

56671720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578 (or 6574 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 56671720 is about 7528.0621676498. The cubic root of 56671720 is about 384.1098680124.

The spelling of 56671720 in words is "fifty-six million, six hundred seventy-one thousand, seven hundred twenty".