91290204 has 72 divisors (see below), whose sum is σ = 250089840. Its totient is φ = 27965952.

The previous prime is 91290191. The next prime is 91290209. The reversal of 91290204 is 40209219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91290209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24582 + ... + 28050.

It is an arithmetic number, because the mean of its divisors is an integer number (3473470).

Almost surely, 2^91290204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91290204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125044920).

91290204 is an abundant number, since it is smaller than the sum of its proper divisors (158799636).

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

91290204 is a wasteful number, since it uses less digits than its factorization.

91290204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 91290204 is about 9554.5907290684. The cubic root of 91290204 is about 450.2717765688.

The spelling of 91290204 in words is "ninety-one million, two hundred ninety thousand, two hundred four".