91151664 has 80 divisors (see below), whose sum is σ = 250876800. Its totient is φ = 28435968.

The previous prime is 91151657. The next prime is 91151681. The reversal of 91151664 is 46615119.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80607 + ... + 81729.

It is an arithmetic number, because the mean of its divisors is an integer number (3135960).

Almost surely, 2^91151664 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 91151664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125438400).

91151664 is an abundant number, since it is smaller than the sum of its proper divisors (159725136).

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

91151664 is a wasteful number, since it uses less digits than its factorization.

91151664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1236 counting only the distinct ones).

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

The square root of 91151664 is about 9547.3380583281. The cubic root of 91151664 is about 450.0438870777.

The spelling of 91151664 in words is "ninety-one million, one hundred fifty-one thousand, six hundred sixty-four".