99990100 has 72 divisors (see below), whose sum is σ = 251108928. Its totient is φ = 33849600.

The previous prime is 99990091. The next prime is 99990113. The reversal of 99990100 is 109999.

It is a self number, because there is not a number n which added to its sum of digits gives 99990100.

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, 57240 + ... + 58960.

It is an arithmetic number, because the mean of its divisors is an integer number (3487624).

Almost surely, 2^99990100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99990100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125554464).

99990100 is an abundant number, since it is smaller than the sum of its proper divisors (151118828).

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

99990100 is a wasteful number, since it uses less digits than its factorization.

99990100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 99990100 is about 9999.5049877481. The cubic root of 99990100 is about 464.1435656126.

The spelling of 99990100 in words is "ninety-nine million, nine hundred ninety thousand, one hundred".