91398664 has 128 divisors (see below), whose sum is σ = 226713600. Its totient is φ = 33592320.

The previous prime is 91398641. The next prime is 91398667. The reversal of 91398664 is 46689319.

Its product of digits (279936) is a multiple of the sum of its prime factors (243).

It is not an unprimeable number, because it can be changed into a prime (91398667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 560647 + ... + 560809.

It is an arithmetic number, because the mean of its divisors is an integer number (1771200).

Almost surely, 2^91398664 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 91398664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113356800).

91398664 is an abundant number, since it is smaller than the sum of its proper divisors (135314936).

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

91398664 is a wasteful number, since it uses less digits than its factorization.

91398664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 239 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 91398664 is about 9560.2648498878. The cubic root of 91398664 is about 450.4500255191.

The spelling of 91398664 in words is "ninety-one million, three hundred ninety-eight thousand, six hundred sixty-four".