99018990 has 64 divisors (see below), whose sum is σ = 301777920. Its totient is φ = 22632480.

The previous prime is 99018973. The next prime is 99019001. The reversal of 99018990 is 9981099.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24306 + ... + 28085.

It is an arithmetic number, because the mean of its divisors is an integer number (4715280).

Almost surely, 2^99018990 is an apocalyptic number.

99018990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99018990 is an abundant number, since it is smaller than the sum of its proper divisors (202758930).

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

99018990 is a wasteful number, since it uses less digits than its factorization.

99018990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52414 (or 52408 counting only the distinct ones).

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

The square root of 99018990 is about 9950.8286087139. The cubic root of 99018990 is about 462.6360778065.

The spelling of 99018990 in words is "ninety-nine million, eighteen thousand, nine hundred ninety".