90908099 has 4 divisors (see below), whose sum is σ = 91200720. Its totient is φ = 90615480.

The previous prime is 90908009. The next prime is 90908107. The reversal of 90908099 is 99080909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99080909 = 6451 ⋅15359.

It is a cyclic number.

It is not a de Polignac number, because 90908099 - 2¹² = 90904003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90908009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145844 + ... + 146465.

It is an arithmetic number, because the mean of its divisors is an integer number (22800180).

Almost surely, 2^90908099 is an apocalyptic number.

90908099 is a deficient number, since it is larger than the sum of its proper divisors (292621).

90908099 is a wasteful number, since it uses less digits than its factorization.

90908099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292620.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 90908099 is about 9534.5738761625. The cubic root of 90908099 is about 449.6426776603.

The spelling of 90908099 in words is "ninety million, nine hundred eight thousand, ninety-nine".