809747864880 has 80 divisors (see below), whose sum is σ = 2529983975424. Its totient is φ = 214232497920.

The previous prime is 809747864869. The next prime is 809747864881. The reversal of 809747864880 is 88468747908.

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

It is not an unprimeable number, because it can be changed into a prime (809747864881) 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, 13252786 + ... + 13313745.

Almost surely, 2^809747864880 is an apocalyptic number.

809747864880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

809747864880 is an abundant number, since it is smaller than the sum of its proper divisors (1720236110544).

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

809747864880 is a wasteful number, since it uses less digits than its factorization.

809747864880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26566674 (or 26566668 counting only the distinct ones).

The product of its (nonzero) digits is 173408256, while the sum is 69.

The spelling of 809747864880 in words is "eight hundred nine billion, seven hundred forty-seven million, eight hundred sixty-four thousand, eight hundred eighty".