56780561 has 16 divisors (see below), whose sum is σ = 62535168. Its totient is φ = 51321600.

The previous prime is 56780551. The next prime is 56780573. The reversal of 56780561 is 16508765.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 56780561 - 2¹⁴ = 56764177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56780551) 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, 85571 + ... + 86231.

It is an arithmetic number, because the mean of its divisors is an integer number (3908448).

Almost surely, 2^56780561 is an apocalyptic number.

It is an amenable number.

56780561 is a deficient number, since it is larger than the sum of its proper divisors (5754607).

56780561 is a wasteful number, since it uses less digits than its factorization.

56780561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 56780561 is about 7535.2877184617. The cubic root of 56780561 is about 384.3556117834.

The spelling of 56780561 in words is "fifty-six million, seven hundred eighty thousand, five hundred sixty-one".