56688857 has 4 divisors (see below), whose sum is σ = 56800740. Its totient is φ = 56576976.

The previous prime is 56688851. The next prime is 56688869. The reversal of 56688857 is 75888665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52070656 + 4618201 = 7216^2 + 2149^2 .

It is a cyclic number.

It is not a de Polignac number, because 56688857 - 2²⁰ = 55640281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56688799 and 56688808.

It is not an unprimeable number, because it can be changed into a prime (56688851) 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, 55178 + ... + 56195.

It is an arithmetic number, because the mean of its divisors is an integer number (14200185).

Almost surely, 2^56688857 is an apocalyptic number.

It is an amenable number.

56688857 is a deficient number, since it is larger than the sum of its proper divisors (111883).

56688857 is a wasteful number, since it uses less digits than its factorization.

56688857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111882.

The product of its digits is 3225600, while the sum is 53.

The square root of 56688857 is about 7529.2002895394. The cubic root of 56688857 is about 384.1485811920.

The spelling of 56688857 in words is "fifty-six million, six hundred eighty-eight thousand, eight hundred fifty-seven".