91864290 has 64 divisors (see below), whose sum is σ = 252999936. Its totient is φ = 20911872.

The previous prime is 91864249. The next prime is 91864291. The reversal of 91864290 is 9246819.

It is not an unprimeable number, because it can be changed into a prime (91864291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60784 + ... + 62276.

It is an arithmetic number, because the mean of its divisors is an integer number (3953124).

Almost surely, 2^91864290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91864290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126499968).

91864290 is an abundant number, since it is smaller than the sum of its proper divisors (161135646).

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

91864290 is a wasteful number, since it uses less digits than its factorization.

91864290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 91864290 is about 9584.5860630494. The cubic root of 91864290 is about 451.2136620499.

The spelling of 91864290 in words is "ninety-one million, eight hundred sixty-four thousand, two hundred ninety".