818988920 has 64 divisors (see below), whose sum is σ = 1951236000. Its totient is φ = 308510208.

The previous prime is 818988893. The next prime is 818988941. The reversal of 818988920 is 29889818.

It is a congruent number.

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, 128366 + ... + 134594.

Almost surely, 2^818988920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818988920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975618000).

818988920 is an abundant number, since it is smaller than the sum of its proper divisors (1132247080).

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

818988920 is a wasteful number, since it uses less digits than its factorization.

818988920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432 (or 6428 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 53.

The square root of 818988920 is about 28617.9824585871. The cubic root of 818988920 is about 935.6053045247.

The spelling of 818988920 in words is "eight hundred eighteen million, nine hundred eighty-eight thousand, nine hundred twenty".