91990302 has 8 divisors (see below), whose sum is σ = 183980616. Its totient is φ = 30663432.

The previous prime is 91990289. The next prime is 91990307. The reversal of 91990302 is 20309919.

It is a sphenic number, since it is the product of 3 distinct primes.

91990302 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91990307) 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, 7665853 + ... + 7665864.

It is an arithmetic number, because the mean of its divisors is an integer number (22997577).

Almost surely, 2^91990302 is an apocalyptic number.

91990302 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91990302 is a wasteful number, since it uses less digits than its factorization.

91990302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15331722.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 91990302 is about 9591.1574901051. The cubic root of 91990302 is about 451.4198805848.

The spelling of 91990302 in words is "ninety-one million, nine hundred ninety thousand, three hundred two".