99800090 has 32 divisors (see below), whose sum is σ = 194034960. Its totient is φ = 36739584.

The previous prime is 99800089. The next prime is 99800101. The reversal of 99800090 is 9000899.

It can be written as a sum of positive squares in 8 ways, for example, as 54007801 + 45792289 = 7349^2 + 6767^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99800090.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52232 + ... + 54108.

Almost surely, 2^99800090 is an apocalyptic number.

99800090 is a deficient number, since it is larger than the sum of its proper divisors (94234870).

99800090 is a wasteful number, since it uses less digits than its factorization.

99800090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 99800090 is about 9989.9994994995. Note that the first 3 decimals coincide. The cubic root of 99800090 is about 463.8493770169.

The spelling of 99800090 in words is "ninety-nine million, eight hundred thousand, ninety".