56855866 has 16 divisors (see below), whose sum is σ = 90129600. Its totient is φ = 26824608.

The previous prime is 56855861. The next prime is 56855893. The reversal of 56855866 is 66855865.

It is not an unprimeable number, because it can be changed into a prime (56855861) 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, 7150 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (5633100).

Almost surely, 2^56855866 is an apocalyptic number.

56855866 is a deficient number, since it is larger than the sum of its proper divisors (33273734).

56855866 is a wasteful number, since it uses less digits than its factorization.

56855866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973.

The product of its digits is 1728000, while the sum is 49.

The square root of 56855866 is about 7540.2828859400. The cubic root of 56855866 is about 384.5254534374.

Subtracting 56855866 from its reverse (66855865), we obtain a palindrome (9999999).

The spelling of 56855866 in words is "fifty-six million, eight hundred fifty-five thousand, eight hundred sixty-six".