56331540 has 144 divisors (see below), whose sum is σ = 185749200. Its totient is φ = 13762560.

The previous prime is 56331533. The next prime is 56331547. The reversal of 56331540 is 4513365.

56331540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (56331533) and next prime (56331547).

It can be written as a sum of positive squares in 8 ways, for example, as 1245456 + 55086084 = 1116^2 + 7422^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56331547) 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 47 ways as a sum of consecutive naturals, for example, 125236 + ... + 125684.

It is an arithmetic number, because the mean of its divisors is an integer number (1289925).

Almost surely, 2^56331540 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 56331540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92874600).

56331540 is an abundant number, since it is smaller than the sum of its proper divisors (129417660).

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

56331540 is a wasteful number, since it uses less digits than its factorization.

56331540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 56331540 is about 7505.4340314202. The cubic root of 56331540 is about 383.3397671678.

The spelling of 56331540 in words is "fifty-six million, three hundred thirty-one thousand, five hundred forty".