90997900 has 90 divisors (see below), whose sum is σ = 230970460. Its totient is φ = 31116960.

The previous prime is 90997891. The next prime is 90997903. The reversal of 90997900 is 979909.

It is not an unprimeable number, because it can be changed into a prime (90997903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 239911 + ... + 240289.

Almost surely, 2^90997900 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 90997900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115485230).

90997900 is an abundant number, since it is smaller than the sum of its proper divisors (139972560).

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

90997900 is a wasteful number, since it uses less digits than its factorization.

90997900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 90997900 is about 9539.2819436266. The cubic root of 90997900 is about 449.7906845460.

The spelling of 90997900 in words is "ninety million, nine hundred ninety-seven thousand, nine hundred".