56781566 has 8 divisors (see below), whose sum is σ = 86250720. Its totient is φ = 28031328.

The previous prime is 56781563. The next prime is 56781589. The reversal of 56781566 is 66518765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56781563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179531 + ... + 179846.

It is an arithmetic number, because the mean of its divisors is an integer number (10781340).

Almost surely, 2^56781566 is an apocalyptic number.

56781566 is a deficient number, since it is larger than the sum of its proper divisors (29469154).

56781566 is a wasteful number, since it uses less digits than its factorization.

56781566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359458.

The product of its digits is 302400, while the sum is 44.

The square root of 56781566 is about 7535.3544044059. The cubic root of 56781566 is about 384.3578794322.

The spelling of 56781566 in words is "fifty-six million, seven hundred eighty-one thousand, five hundred sixty-six".