91689832 has 64 divisors (see below), whose sum is σ = 191394000. Its totient is φ = 40919040.

The previous prime is 91689797. The next prime is 91689833. The reversal of 91689832 is 23898619.

It can be written as a sum of positive squares in 8 ways, for example, as 181476 + 91508356 = 426^2 + 9566^2 .

It is not an unprimeable number, because it can be changed into a prime (91689833) 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, 615294 + ... + 615442.

Almost surely, 2^91689832 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 91689832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95697000).

91689832 is an abundant number, since it is smaller than the sum of its proper divisors (99704168).

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

91689832 is a wasteful number, since it uses less digits than its factorization.

91689832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 322 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 91689832 is about 9575.4807712198. The cubic root of 91689832 is about 450.9278501699.

The spelling of 91689832 in words is "ninety-one million, six hundred eighty-nine thousand, eight hundred thirty-two".