91687618 has 16 divisors (see below), whose sum is σ = 155208960. Its totient is φ = 40238800.

The previous prime is 91687573. The next prime is 91687619. The reversal of 91687618 is 81678619.

It is not an unprimeable number, because it can be changed into a prime (91687619) 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 7 ways as a sum of consecutive naturals, for example, 71218 + ... + 72493.

It is an arithmetic number, because the mean of its divisors is an integer number (9700560).

Almost surely, 2^91687618 is an apocalyptic number.

91687618 is a deficient number, since it is larger than the sum of its proper divisors (63521342).

91687618 is a wasteful number, since it uses less digits than its factorization.

91687618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143753.

The product of its digits is 145152, while the sum is 46.

The square root of 91687618 is about 9575.3651627497. The cubic root of 91687618 is about 450.9242206787.

The spelling of 91687618 in words is "ninety-one million, six hundred eighty-seven thousand, six hundred eighteen".