811589980 has 12 divisors (see below), whose sum is σ = 1704339000. Its totient is φ = 324635984.

The previous prime is 811589941. The next prime is 811589993. The reversal of 811589980 is 89985118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20289730 + ... + 20289769.

It is an arithmetic number, because the mean of its divisors is an integer number (142028250).

Almost surely, 2^811589980 is an apocalyptic number.

It is an amenable number.

811589980 is an abundant number, since it is smaller than the sum of its proper divisors (892749020).

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

811589980 is a wasteful number, since it uses less digits than its factorization.

811589980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40579508 (or 40579506 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 49.

The square root of 811589980 is about 28488.4183485149. The cubic root of 811589980 is about 932.7792836959.

The spelling of 811589980 in words is "eight hundred eleven million, five hundred eighty-nine thousand, nine hundred eighty".