91320564 has 24 divisors (see below), whose sum is σ = 215193888. Its totient is φ = 30138400.

The previous prime is 91320563. The next prime is 91320569. The reversal of 91320564 is 46502319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91320563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36462 + ... + 38885.

It is an arithmetic number, because the mean of its divisors is an integer number (8966412).

Almost surely, 2^91320564 is an apocalyptic number.

It is an amenable number.

91320564 is an abundant number, since it is smaller than the sum of its proper divisors (123873324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91320564 is a wasteful number, since it uses less digits than its factorization.

91320564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75455 (or 75453 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 91320564 is about 9556.1793620672. The cubic root of 91320564 is about 450.3216860348.

The spelling of 91320564 in words is "ninety-one million, three hundred twenty thousand, five hundred sixty-four".