91788963 has 16 divisors (see below), whose sum is σ = 140121600. Its totient is φ = 52356096.

The previous prime is 91788941. The next prime is 91789081. The reversal of 91788963 is 36988719.

It is not a de Polignac number, because 91788963 - 2⁸ = 91788707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91784963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8931 + ... + 16227.

It is an arithmetic number, because the mean of its divisors is an integer number (8757600).

Almost surely, 2^91788963 is an apocalyptic number.

91788963 is a deficient number, since it is larger than the sum of its proper divisors (48332637).

91788963 is a wasteful number, since it uses less digits than its factorization.

91788963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7906.

The product of its digits is 653184, while the sum is 51.

The square root of 91788963 is about 9580.6556664980. The cubic root of 91788963 is about 451.0902994035.

The spelling of 91788963 in words is "ninety-one million, seven hundred eighty-eight thousand, nine hundred sixty-three".