91507664 has 40 divisors (see below), whose sum is σ = 180792000. Its totient is φ = 44861696.

The previous prime is 91507649. The next prime is 91507679. The reversal of 91507664 is 46670519.

It is an interprime number because it is at equal distance from previous prime (91507649) and next prime (91507679).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254717 + ... + 255075.

It is an arithmetic number, because the mean of its divisors is an integer number (4519800).

Almost surely, 2^91507664 is an apocalyptic number.

It is an amenable number.

91507664 is a deficient number, since it is larger than the sum of its proper divisors (89284336).

91507664 is a wasteful number, since it uses less digits than its factorization.

91507664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 91507664 is about 9565.9638301637. The cubic root of 91507664 is about 450.6290199209.

The spelling of 91507664 in words is "ninety-one million, five hundred seven thousand, six hundred sixty-four".