91229868 has 96 divisors (see below), whose sum is σ = 259929600. Its totient is φ = 27542592.

The previous prime is 91229843. The next prime is 91229893. The reversal of 91229868 is 86892219.

It is an interprime number because it is at equal distance from previous prime (91229843) and next prime (91229893).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46230 + ... + 48162.

It is an arithmetic number, because the mean of its divisors is an integer number (2707600).

Almost surely, 2^91229868 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 91229868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129964800).

91229868 is an abundant number, since it is smaller than the sum of its proper divisors (168699732).

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

91229868 is a wasteful number, since it uses less digits than its factorization.

91229868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1980 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 91229868 is about 9551.4327721028. The cubic root of 91229868 is about 450.1725560458.

The spelling of 91229868 in words is "ninety-one million, two hundred twenty-nine thousand, eight hundred sixty-eight".