91917668 has 24 divisors (see below), whose sum is σ = 170325120. Its totient is φ = 43282080.

The previous prime is 91917643. The next prime is 91917671. The reversal of 91917668 is 86671919.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9653 + ... + 16643.

It is an arithmetic number, because the mean of its divisors is an integer number (7096880).

Almost surely, 2^91917668 is an apocalyptic number.

It is an amenable number.

91917668 is a deficient number, since it is larger than the sum of its proper divisors (78407452).

91917668 is a wasteful number, since it uses less digits than its factorization.

91917668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187 (or 7185 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 91917668 is about 9587.3702338024. The cubic root of 91917668 is about 451.3010381111.

The spelling of 91917668 in words is "ninety-one million, nine hundred seventeen thousand, six hundred sixty-eight".