91609787264 has 32 divisors (see below), whose sum is σ = 182610234840. Its totient is φ = 45778199040.

The previous prime is 91609787239. The next prime is 91609787273. The reversal of 91609787264 is 46278790619.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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, 12854 + ... + 428234.

Almost surely, 2^91609787264 is an apocalyptic number.

It is an amenable number.

91609787264 is a deficient number, since it is larger than the sum of its proper divisors (91000447576).

91609787264 is a wasteful number, since it uses less digits than its factorization.

91609787264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417118 (or 417106 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 91609787264 in words is "ninety-one billion, six hundred nine million, seven hundred eighty-seven thousand, two hundred sixty-four".