91204564 has 12 divisors (see below), whose sum is σ = 174117888. Its totient is φ = 41456600.

The previous prime is 91204549. The next prime is 91204567. The reversal of 91204564 is 46540219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91204567) 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 3 ways as a sum of consecutive naturals, for example, 1036372 + ... + 1036459.

It is an arithmetic number, because the mean of its divisors is an integer number (14509824).

Almost surely, 2^91204564 is an apocalyptic number.

It is an amenable number.

91204564 is a deficient number, since it is larger than the sum of its proper divisors (82913324).

91204564 is a wasteful number, since it uses less digits than its factorization.

91204564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072846 (or 2072844 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 91204564 is about 9550.1080622158. The cubic root of 91204564 is about 450.1309314480.

The spelling of 91204564 in words is "ninety-one million, two hundred four thousand, five hundred sixty-four".