99999000990 has 48 divisors (see below), whose sum is σ = 297139890528. Its totient is φ = 22856914368.

The previous prime is 99999000979. The next prime is 99999001007. The reversal of 99999000990 is 9900099999.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79363657 + ... + 79364916.

It is an arithmetic number, because the mean of its divisors is an integer number (6190414386).

Almost surely, 2^99999000990 is an apocalyptic number.

99999000990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99999000990 is an abundant number, since it is smaller than the sum of its proper divisors (197140889538).

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

99999000990 is a wasteful number, since it uses less digits than its factorization.

99999000990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158728593 (or 158728590 counting only the distinct ones).

The product of its (nonzero) digits is 4782969, while the sum is 63.

The spelling of 99999000990 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety", and thus it is an aban number.