989595990 has 24 divisors (see below), whose sum is σ = 2572949808. Its totient is φ = 263892240.

The previous prime is 989595989. The next prime is 989596001. The reversal of 989595990 is 99595989.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5497666 + ... + 5497845.

It is an arithmetic number, because the mean of its divisors is an integer number (107206242).

Almost surely, 2^989595990 is an apocalyptic number.

989595990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

989595990 is an abundant number, since it is smaller than the sum of its proper divisors (1583353818).

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

989595990 is a wasteful number, since it uses less digits than its factorization.

989595990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10995524 (or 10995521 counting only the distinct ones).

The product of its (nonzero) digits is 11809800, while the sum is 63.

The square root of 989595990 is about 31457.8446496259. The cubic root of 989595990 is about 996.5198996173.

The spelling of 989595990 in words is "nine hundred eighty-nine million, five hundred ninety-five thousand, nine hundred ninety".