56491320 has 128 divisors (see below), whose sum is σ = 176256000. Its totient is φ = 14476800.

The previous prime is 56491319. The next prime is 56491327. The reversal of 56491320 is 2319465.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56491327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 559270 + ... + 559370.

It is an arithmetic number, because the mean of its divisors is an integer number (1377000).

Almost surely, 2^56491320 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 56491320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88128000).

56491320 is an abundant number, since it is smaller than the sum of its proper divisors (119764680).

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

56491320 is a wasteful number, since it uses less digits than its factorization.

56491320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 56491320 is about 7516.0707819977. The cubic root of 56491320 is about 383.7018627705.

The spelling of 56491320 in words is "fifty-six million, four hundred ninety-one thousand, three hundred twenty".