91906785 has 32 divisors (see below), whose sum is σ = 168668160. Its totient is φ = 47433600.

The previous prime is 91906753. The next prime is 91906807. The reversal of 91906785 is 58760919.

It is not a de Polignac number, because 91906785 - 2⁵ = 91906753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 91906785.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6796 + ... + 15165.

It is an arithmetic number, because the mean of its divisors is an integer number (5270880).

Almost surely, 2^91906785 is an apocalyptic number.

It is an amenable number.

91906785 is a deficient number, since it is larger than the sum of its proper divisors (76761375).

91906785 is a wasteful number, since it uses less digits than its factorization.

91906785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22006 (or 22000 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 91906785 is about 9586.8026473898. The cubic root of 91906785 is about 451.2832261454.

The spelling of 91906785 in words is "ninety-one million, nine hundred six thousand, seven hundred eighty-five".