91657216 has 88 divisors (see below), whose sum is σ = 220748480. Its totient is φ = 37158912.

The previous prime is 91657207. The next prime is 91657219. The reversal of 91657216 is 61275619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91657219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135856 + ... + 136528.

Almost surely, 2^91657216 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 91657216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110374240).

91657216 is an abundant number, since it is smaller than the sum of its proper divisors (129091264).

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

91657216 is a wasteful number, since it uses less digits than its factorization.

91657216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 701 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 91657216 is about 9573.7775198717. Note that the first 3 decimals coincide. The cubic root of 91657216 is about 450.8743756580.

The spelling of 91657216 in words is "ninety-one million, six hundred fifty-seven thousand, two hundred sixteen".