56137728 has 48 divisors (see below), whose sum is σ = 149680440. Its totient is φ = 18710528.

The previous prime is 56137727. The next prime is 56137771. The reversal of 56137728 is 82773165.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56137727) 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, 1576 + ... + 10712.

Almost surely, 2^56137728 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 56137728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74840220).

56137728 is an abundant number, since it is smaller than the sum of its proper divisors (93542712).

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

56137728 is an equidigital number, since it uses as much as digits as its factorization.

56137728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9162 (or 9142 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 56137728 is about 7492.5114614527. The cubic root of 56137728 is about 382.8996276142.

It can be divided in two parts, 56137 and 728, that added together give a palindrome (56865).

The spelling of 56137728 in words is "fifty-six million, one hundred thirty-seven thousand, seven hundred twenty-eight".