56391636 has 48 divisors (see below), whose sum is σ = 151249280. Its totient is φ = 16018560.

The previous prime is 56391593. The next prime is 56391637. The reversal of 56391636 is 63619365.

It is a super-2 number, since 2×56391636² = 6360033221512992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56391594 and 56391603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56391637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13350 + ... + 17058.

Almost surely, 2^56391636 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 56391636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75624640).

56391636 is an abundant number, since it is smaller than the sum of its proper divisors (94857644).

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

56391636 is a wasteful number, since it uses less digits than its factorization.

56391636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904 (or 3902 counting only the distinct ones).

The product of its digits is 87480, while the sum is 39.

The square root of 56391636 is about 7509.4364635437. The cubic root of 56391636 is about 383.4760377737.

The spelling of 56391636 in words is "fifty-six million, three hundred ninety-one thousand, six hundred thirty-six".