56721156 has 48 divisors (see below), whose sum is σ = 140145600. Its totient is φ = 17805312.

The previous prime is 56721149. The next prime is 56721157. The reversal of 56721156 is 65112765.

56721156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (56721157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43360 + ... + 44648.

It is an arithmetic number, because the mean of its divisors is an integer number (2919700).

Almost surely, 2^56721156 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 56721156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70072800).

56721156 is an abundant number, since it is smaller than the sum of its proper divisors (83424444).

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

56721156 is a wasteful number, since it uses less digits than its factorization.

56721156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508 (or 1506 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 56721156 is about 7531.3448998170. The cubic root of 56721156 is about 384.2215247414.

The spelling of 56721156 in words is "fifty-six million, seven hundred twenty-one thousand, one hundred fifty-six".