90599990 has 64 divisors (see below), whose sum is σ = 185383296. Its totient is φ = 31629312.

The previous prime is 90599989. The next prime is 90600001. The reversal of 90599990 is 9999509.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 469334 + ... + 469526.

It is an arithmetic number, because the mean of its divisors is an integer number (2896614).

Almost surely, 2^90599990 is an apocalyptic number.

90599990 is an abundant number, since it is smaller than the sum of its proper divisors (94783306).

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

90599990 is a wasteful number, since it uses less digits than its factorization.

90599990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 295245, while the sum is 50.

The square root of 90599990 is about 9518.4027021344. The cubic root of 90599990 is about 449.1341209735.

The spelling of 90599990 in words is "ninety million, five hundred ninety-nine thousand, nine hundred ninety".