91153680 has 80 divisors (see below), whose sum is σ = 288624384. Its totient is φ = 23787520.

The previous prime is 91153663. The next prime is 91153691. The reversal of 91153680 is 8635119.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7240 + ... + 15320.

Almost surely, 2^91153680 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 91153680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144312192).

91153680 is an abundant number, since it is smaller than the sum of its proper divisors (197470704).

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

91153680 is a wasteful number, since it uses less digits than its factorization.

91153680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144 (or 8138 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 91153680 is about 9547.4436369114. The cubic root of 91153680 is about 450.0472049246.

Adding to 91153680 its reverse (8635119), we get a palindrome (99788799).

The spelling of 91153680 in words is "ninety-one million, one hundred fifty-three thousand, six hundred eighty".