91715868 has 24 divisors (see below), whose sum is σ = 237782160. Its totient is φ = 30571920.

The previous prime is 91715863. The next prime is 91715873. The reversal of 91715868 is 86851719.

It is an interprime number because it is at equal distance from previous prime (91715863) and next prime (91715873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91715863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424503 + ... + 424718.

It is an arithmetic number, because the mean of its divisors is an integer number (9907590).

Almost surely, 2^91715868 is an apocalyptic number.

It is an amenable number.

91715868 is an abundant number, since it is smaller than the sum of its proper divisors (146066292).

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

91715868 is a wasteful number, since it uses less digits than its factorization.

91715868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849234 (or 849226 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 91715868 is about 9576.8401887052. The cubic root of 91715868 is about 450.9705275536.

The spelling of 91715868 in words is "ninety-one million, seven hundred fifteen thousand, eight hundred sixty-eight".