91678263 has 16 divisors (see below), whose sum is σ = 130014720. Its totient is φ = 57262976.

The previous prime is 91678261. The next prime is 91678333. The reversal of 91678263 is 36287619.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91678263 - 2¹ = 91678261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91678261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7618 + ... + 15536.

It is an arithmetic number, because the mean of its divisors is an integer number (8125920).

Almost surely, 2^91678263 is an apocalyptic number.

91678263 is a deficient number, since it is larger than the sum of its proper divisors (38336457).

91678263 is a wasteful number, since it uses less digits than its factorization.

91678263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8166.

The product of its digits is 108864, while the sum is 42.

The square root of 91678263 is about 9574.8766571690. The cubic root of 91678263 is about 450.9088840402.

The spelling of 91678263 in words is "ninety-one million, six hundred seventy-eight thousand, two hundred sixty-three".