998010990 has 64 divisors (see below), whose sum is σ = 2733318720. Its totient is φ = 258940800.

The previous prime is 998010989. The next prime is 998011031. The reversal of 998010990 is 99010899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39961 + ... + 59940.

It is an arithmetic number, because the mean of its divisors is an integer number (42708105).

Almost surely, 2^998010990 is an apocalyptic number.

998010990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

998010990 is an abundant number, since it is smaller than the sum of its proper divisors (1735307730).

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

998010990 is a wasteful number, since it uses less digits than its factorization.

998010990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99954 (or 99948 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 998010990 is about 31591.3119385694. The cubic root of 998010990 is about 999.3365566069.

The spelling of 998010990 in words is "nine hundred ninety-eight million, ten thousand, nine hundred ninety".