99980090 has 48 divisors (see below), whose sum is σ = 220384800. Its totient is φ = 32471712.

The previous prime is 99980087. The next prime is 99980123. The reversal of 99980090 is 9008999.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon 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, 3941 + ... + 14679.

It is an arithmetic number, because the mean of its divisors is an integer number (4591350).

Almost surely, 2^99980090 is an apocalyptic number.

99980090 is an abundant number, since it is smaller than the sum of its proper divisors (120404710).

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

99980090 is a wasteful number, since it uses less digits than its factorization.

99980090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10779 (or 10772 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 99980090 is about 9999.0044504441. The cubic root of 99980090 is about 464.1280766388.

The spelling of 99980090 in words is "ninety-nine million, nine hundred eighty thousand, ninety".