91389186688 has 32 divisors (see below), whose sum is σ = 182387921760. Its totient is φ = 45613394688.

The previous prime is 91389186661. The next prime is 91389186739. The reversal of 91389186688 is 88668198319.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562020 + ... + 706147.

It is an arithmetic number, because the mean of its divisors is an integer number (5699622555).

Almost surely, 2^91389186688 is an apocalyptic number.

It is an amenable number.

91389186688 is a deficient number, since it is larger than the sum of its proper divisors (90998735072).

91389186688 is a wasteful number, since it uses less digits than its factorization.

91389186688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268744 (or 1268732 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 67.

The spelling of 91389186688 in words is "ninety-one billion, three hundred eighty-nine million, one hundred eighty-six thousand, six hundred eighty-eight".