91032740 has 96 divisors (see below), whose sum is σ = 209986560. Its totient is φ = 33062400.

The previous prime is 91032737. The next prime is 91032761. The reversal of 91032740 is 4723019.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1096739 + ... + 1096821.

It is an arithmetic number, because the mean of its divisors is an integer number (2187360).

Almost surely, 2^91032740 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 91032740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104993280).

91032740 is an abundant number, since it is smaller than the sum of its proper divisors (118953820).

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

91032740 is a wasteful number, since it uses less digits than its factorization.

91032740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 91032740 is about 9541.1079021254. The cubic root of 91032740 is about 449.8480804051.

Adding to 91032740 its reverse (4723019), we get a palindrome (95755759).

The spelling of 91032740 in words is "ninety-one million, thirty-two thousand, seven hundred forty".