56561380 has 24 divisors (see below), whose sum is σ = 125766648. Its totient is φ = 21293568.

The previous prime is 56561371. The next prime is 56561381. The reversal of 56561380 is 8316565.

It can be written as a sum of positive squares in 4 ways, for example, as 27206656 + 29354724 = 5216^2 + 5418^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (56561381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82839 + ... + 83518.

It is an arithmetic number, because the mean of its divisors is an integer number (5240277).

Almost surely, 2^56561380 is an apocalyptic number.

It is an amenable number.

56561380 is an abundant number, since it is smaller than the sum of its proper divisors (69205268).

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

56561380 is a wasteful number, since it uses less digits than its factorization.

56561380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166383 (or 166381 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 56561380 is about 7520.7300177576. The cubic root of 56561380 is about 383.8604183808.

The spelling of 56561380 in words is "fifty-six million, five hundred sixty-one thousand, three hundred eighty".