866044560 has 80 divisors (see below), whose sum is σ = 2741895936. Its totient is φ = 226028544.

The previous prime is 866044523. The next prime is 866044577. The reversal of 866044560 is 65440668.

866044560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27109 + ... + 49668.

Almost surely, 2^866044560 is an apocalyptic number.

866044560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

866044560 is an abundant number, since it is smaller than the sum of its proper divisors (1875851376).

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

866044560 is a wasteful number, since it uses less digits than its factorization.

866044560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76840 (or 76834 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 866044560 is about 29428.6350346053. The cubic root of 866044560 is about 953.1913209929.

The spelling of 866044560 in words is "eight hundred sixty-six million, forty-four thousand, five hundred sixty".