91908645 has 32 divisors (see below), whose sum is σ = 152616960. Its totient is φ = 47181120.

The previous prime is 91908631. The next prime is 91908653. The reversal of 91908645 is 54680919.

It is not a de Polignac number, because 91908645 - 2⁹ = 91908133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91908597 and 91908606.

It is a congruent number.

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, 110722 + ... + 111548.

It is an arithmetic number, because the mean of its divisors is an integer number (4769280).

Almost surely, 2^91908645 is an apocalyptic number.

It is an amenable number.

91908645 is a deficient number, since it is larger than the sum of its proper divisors (60708315).

91908645 is a wasteful number, since it uses less digits than its factorization.

91908645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 91908645 is about 9586.8996552587. The cubic root of 91908645 is about 451.2862704660.

The spelling of 91908645 in words is "ninety-one million, nine hundred eight thousand, six hundred forty-five".