56639388 has 48 divisors (see below), whose sum is σ = 144475520. Its totient is φ = 17164224.

The previous prime is 56639383. The next prime is 56639411. The reversal of 56639388 is 88393665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56639383) 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, 7743 + ... + 13161.

Almost surely, 2^56639388 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 56639388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72237760).

56639388 is an abundant number, since it is smaller than the sum of its proper divisors (87836132).

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

56639388 is a wasteful number, since it uses less digits than its factorization.

56639388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5506 (or 5504 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 56639388 is about 7525.9144294896. The cubic root of 56639388 is about 384.0368074527.

It can be divided in two parts, 5663 and 9388, that added together give a palindrome (15051).

The spelling of 56639388 in words is "fifty-six million, six hundred thirty-nine thousand, three hundred eighty-eight".