91088864 has 12 divisors (see below), whose sum is σ = 179331264. Its totient is φ = 45544416.

The previous prime is 91088863. The next prime is 91088887. The reversal of 91088864 is 46888019.

It is a happy number.

It is a super-2 number, since 2×91088864² = 16594362289620992, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91088863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1423232 + ... + 1423295.

It is an arithmetic number, because the mean of its divisors is an integer number (14944272).

Almost surely, 2^91088864 is an apocalyptic number.

It is an amenable number.

91088864 is a deficient number, since it is larger than the sum of its proper divisors (88242400).

91088864 is a wasteful number, since it uses less digits than its factorization.

91088864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846537 (or 2846529 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 91088864 is about 9544.0486168083. The cubic root of 91088864 is about 449.9405090079.

The spelling of 91088864 in words is "ninety-one million, eighty-eight thousand, eight hundred sixty-four".