91328715 has 20 divisors (see below), whose sum is σ = 163715904. Its totient is φ = 48708432.

The previous prime is 91328681. The next prime is 91328717. The reversal of 91328715 is 51782319.

It is not a de Polignac number, because 91328715 - 2⁹ = 91328203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91328715.

It is not an unprimeable number, because it can be changed into a prime (91328717) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 112347 + ... + 113156.

Almost surely, 2^91328715 is an apocalyptic number.

91328715 is a deficient number, since it is larger than the sum of its proper divisors (72387189).

91328715 is a wasteful number, since it uses less digits than its factorization.

91328715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225520 (or 225511 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 91328715 is about 9556.6058305237. The cubic root of 91328715 is about 450.3350837578.

The spelling of 91328715 in words is "ninety-one million, three hundred twenty-eight thousand, seven hundred fifteen".