91688357 has 16 divisors (see below), whose sum is σ = 99610560. Its totient is φ = 84120192.

The previous prime is 91688347. The next prime is 91688369. The reversal of 91688357 is 75388619.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91688357 - 2⁸ = 91688101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91688347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83033 + ... + 84129.

It is an arithmetic number, because the mean of its divisors is an integer number (6225660).

Almost surely, 2^91688357 is an apocalyptic number.

It is an amenable number.

91688357 is a deficient number, since it is larger than the sum of its proper divisors (7922203).

91688357 is a wasteful number, since it uses less digits than its factorization.

91688357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its digits is 362880, while the sum is 47.

The square root of 91688357 is about 9575.4037512786. The cubic root of 91688357 is about 450.9254321549.

The spelling of 91688357 in words is "ninety-one million, six hundred eighty-eight thousand, three hundred fifty-seven".