56781380 has 12 divisors (see below), whose sum is σ = 119240940. Its totient is φ = 22712544.

The previous prime is 56781359. The next prime is 56781383. The reversal of 56781380 is 8318765.

It can be written as a sum of positive squares in 2 ways, for example, as 33200644 + 23580736 = 5762^2 + 4856^2 .

It is a super-2 number, since 2×56781380² = 6448250229408800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56781383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419515 + ... + 1419554.

It is an arithmetic number, because the mean of its divisors is an integer number (9936745).

Almost surely, 2^56781380 is an apocalyptic number.

It is an amenable number.

56781380 is an abundant number, since it is smaller than the sum of its proper divisors (62459560).

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

56781380 is a wasteful number, since it uses less digits than its factorization.

56781380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839078 (or 2839076 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 56781380 is about 7535.3420625742. The cubic root of 56781380 is about 384.3574597500.

The spelling of 56781380 in words is "fifty-six million, seven hundred eighty-one thousand, three hundred eighty".