90991292 has 24 divisors (see below), whose sum is σ = 182641536. Its totient is φ = 38855088.

The previous prime is 90991283. The next prime is 90991337. The reversal of 90991292 is 29219909.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2183 + ... + 13665.

It is an arithmetic number, because the mean of its divisors is an integer number (7610064).

Almost surely, 2^90991292 is an apocalyptic number.

It is an amenable number.

90991292 is an abundant number, since it is smaller than the sum of its proper divisors (91650244).

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

90991292 is a wasteful number, since it uses less digits than its factorization.

90991292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11777 (or 11775 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 90991292 is about 9538.9355800320. The cubic root of 90991292 is about 449.7797967900.

The spelling of 90991292 in words is "ninety million, nine hundred ninety-one thousand, two hundred ninety-two".