90909292 has 12 divisors (see below), whose sum is σ = 160667136. Its totient is φ = 45004400.

The previous prime is 90909253. The next prime is 90909307. The reversal of 90909292 is 29290909.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112108 + ... + 112915.

It is an arithmetic number, because the mean of its divisors is an integer number (13388928).

Almost surely, 2^90909292 is an apocalyptic number.

It is an amenable number.

90909292 is a deficient number, since it is larger than the sum of its proper divisors (69757844).

90909292 is a wasteful number, since it uses less digits than its factorization.

90909292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225128 (or 225126 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 90909292 is about 9534.6364377463. The cubic root of 90909292 is about 449.6446445601.

The spelling of 90909292 in words is "ninety million, nine hundred nine thousand, two hundred ninety-two".