91909632 has 80 divisors (see below), whose sum is σ = 249693840. Its totient is φ = 30031872.

The previous prime is 91909603. The next prime is 91909639. The reversal of 91909632 is 23690919.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91909639) 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, 80844 + ... + 81972.

It is an arithmetic number, because the mean of its divisors is an integer number (3121173).

Almost surely, 2^91909632 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 91909632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124846920).

91909632 is an abundant number, since it is smaller than the sum of its proper divisors (157784208).

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

91909632 is a wasteful number, since it uses less digits than its factorization.

91909632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 91909632 is about 9586.9511316163. The cubic root of 91909632 is about 451.2878859032.

The spelling of 91909632 in words is "ninety-one million, nine hundred nine thousand, six hundred thirty-two".