809988880 has 40 divisors (see below), whose sum is σ = 1885897152. Its totient is φ = 323535744.

The previous prime is 809988871. The next prime is 809988889. The reversal of 809988880 is 88889908.

It is an interprime number because it is at equal distance from previous prime (809988871) and next prime (809988889).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (809988889) 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, 52627 + ... + 66253.

Almost surely, 2^809988880 is an apocalyptic number.

809988880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

809988880 is an abundant number, since it is smaller than the sum of its proper divisors (1075908272).

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

809988880 is a wasteful number, since it uses less digits than its factorization.

809988880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14383 (or 14377 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 58.

The square root of 809988880 is about 28460.3035823584. The cubic root of 809988880 is about 932.1654860351.

The spelling of 809988880 in words is "eight hundred nine million, nine hundred eighty-eight thousand, eight hundred eighty".