90999100 has 36 divisors (see below), whose sum is σ = 204283800. Its totient is φ = 35143360.

The previous prime is 90999059. The next prime is 90999101. The reversal of 90999100 is 199909.

It is a self number, because there is not a number n which added to its sum of digits gives 90999100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90999101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12790 + ... + 18589.

It is an arithmetic number, because the mean of its divisors is an integer number (5674550).

Almost surely, 2^90999100 is an apocalyptic number.

It is an amenable number.

90999100 is an abundant number, since it is smaller than the sum of its proper divisors (113284700).

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

90999100 is a wasteful number, since it uses less digits than its factorization.

90999100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31422 (or 31415 counting only the distinct ones).

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

The square root of 90999100 is about 9539.3448412352. The cubic root of 90999100 is about 449.7926616848.

The spelling of 90999100 in words is "ninety million, nine hundred ninety-nine thousand, one hundred".