91680742736 has 20 divisors (see below), whose sum is σ = 193779752064. Its totient is φ = 41673064800.

The previous prime is 91680742711. The next prime is 91680742763. The reversal of 91680742736 is 63724708619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260456480 + ... + 260456831.

Almost surely, 2^91680742736 is an apocalyptic number.

It is an amenable number.

91680742736 is an abundant number, since it is smaller than the sum of its proper divisors (102099009328).

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

91680742736 is a wasteful number, since it uses less digits than its factorization.

91680742736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520913330 (or 520913324 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 91680742736 in words is "ninety-one billion, six hundred eighty million, seven hundred forty-two thousand, seven hundred thirty-six".