56521836 has 72 divisors (see below), whose sum is σ = 164213504. Its totient is φ = 16057440.

The previous prime is 56521831. The next prime is 56521837. The reversal of 56521836 is 63812565.

56521836 is a `hidden beast` number, since 56 + 521 + 83 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 56521836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56521831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52641 + ... + 53703.

Almost surely, 2^56521836 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 56521836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82106752).

56521836 is an abundant number, since it is smaller than the sum of its proper divisors (107691668).

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

56521836 is a wasteful number, since it uses less digits than its factorization.

56521836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1286 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 56521836 is about 7518.1005579867. The cubic root of 56521836 is about 383.7709408655.

The spelling of 56521836 in words is "fifty-six million, five hundred twenty-one thousand, eight hundred thirty-six".