56856636 has 72 divisors (see below), whose sum is σ = 154771344. Its totient is φ = 17533440.

The previous prime is 56856601. The next prime is 56856649. The reversal of 56856636 is 63665865.

56856636 is a `hidden beast` number, since 5 + 6 + 8 + 5 + 6 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 56856591 and 56856600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36571 + ... + 38093.

It is an arithmetic number, because the mean of its divisors is an integer number (2149602).

Almost surely, 2^56856636 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 56856636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77385672).

56856636 is an abundant number, since it is smaller than the sum of its proper divisors (97914708).

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

56856636 is a wasteful number, since it uses less digits than its factorization.

56856636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1606 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 56856636 is about 7540.3339448595. Note that the first 3 decimals coincide. The cubic root of 56856636 is about 384.5271893079.

It can be divided in two parts, 5685 and 6636, that added together give a palindrome (12321).

The spelling of 56856636 in words is "fifty-six million, eight hundred fifty-six thousand, six hundred thirty-six".