91808645 has 8 divisors (see below), whose sum is σ = 110242080. Its totient is φ = 73399120.

The previous prime is 91808623. The next prime is 91808659. The reversal of 91808645 is 54680819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91808645 - 2¹⁶ = 91743109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3986 + ... + 14124.

It is an arithmetic number, because the mean of its divisors is an integer number (13780260).

Almost surely, 2^91808645 is an apocalyptic number.

It is an amenable number.

91808645 is a deficient number, since it is larger than the sum of its proper divisors (18433435).

91808645 is a wasteful number, since it uses less digits than its factorization.

91808645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11955.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 91808645 is about 9581.6827853984. The cubic root of 91808645 is about 451.1225390268.

The spelling of 91808645 in words is "ninety-one million, eight hundred eight thousand, six hundred forty-five".