90019998 has 40 divisors (see below), whose sum is σ = 213583392. Its totient is φ = 28240704.

The previous prime is 90019997. The next prime is 90020003. The reversal of 90019998 is 89991009.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90019991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13590 + ... + 19097.

Almost surely, 2^90019998 is an apocalyptic number.

90019998 is an abundant number, since it is smaller than the sum of its proper divisors (123563394).

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

90019998 is a wasteful number, since it uses less digits than its factorization.

90019998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32718 (or 32709 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 90019998 is about 9487.8869091068. The cubic root of 90019998 is about 448.1736644687.

The spelling of 90019998 in words is "ninety million, nineteen thousand, nine hundred ninety-eight".