91831632 has 80 divisors (see below), whose sum is σ = 252186240. Its totient is φ = 28740096.

The previous prime is 91831609. The next prime is 91831633. The reversal of 91831632 is 23613819.

It is a junction number, because it is equal to n+sod(n) for n = 91831593 and 91831602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91831633) 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, 50613 + ... + 52395.

It is an arithmetic number, because the mean of its divisors is an integer number (3152328).

Almost surely, 2^91831632 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 91831632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126093120).

91831632 is an abundant number, since it is smaller than the sum of its proper divisors (160354608).

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

91831632 is a wasteful number, since it uses less digits than its factorization.

91831632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860 (or 1854 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 91831632 is about 9582.8822386587. The cubic root of 91831632 is about 451.1601864925.

The spelling of 91831632 in words is "ninety-one million, eight hundred thirty-one thousand, six hundred thirty-two".