56591220 has 48 divisors (see below), whose sum is σ = 181093248. Its totient is φ = 12935040.

The previous prime is 56591219. The next prime is 56591221. The reversal of 56591220 is 2219565.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (56591219) and next prime (56591221).

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 (56591221) 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, 66951 + ... + 67790.

It is an arithmetic number, because the mean of its divisors is an integer number (3772776).

Almost surely, 2^56591220 is an apocalyptic number.

It is an amenable number.

56591220 is an abundant number, since it is smaller than the sum of its proper divisors (124502028).

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

56591220 is a wasteful number, since it uses less digits than its factorization.

56591220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134760 (or 134758 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 56591220 is about 7522.7136061397. The cubic root of 56591220 is about 383.9279107295.

The spelling of 56591220 in words is "fifty-six million, five hundred ninety-one thousand, two hundred twenty".