91891632 has 80 divisors (see below), whose sum is σ = 272339712. Its totient is φ = 26154240.

The previous prime is 91891621. The next prime is 91891637. The reversal of 91891632 is 23619819.

It is not an unprimeable number, because it can be changed into a prime (91891637) 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, 164698 + ... + 165254.

Almost surely, 2^91891632 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 91891632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136169856).

91891632 is an abundant number, since it is smaller than the sum of its proper divisors (180448080).

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

91891632 is a wasteful number, since it uses less digits than its factorization.

91891632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066 (or 1060 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 91891632 is about 9586.0123096103. The cubic root of 91891632 is about 451.2584232230.

The spelling of 91891632 in words is "ninety-one million, eight hundred ninety-one thousand, six hundred thirty-two".