91687955742 has 24 divisors (see below), whose sum is σ = 200624144760. Its totient is φ = 30260050800.

The previous prime is 91687955741. The next prime is 91687955761. The reversal of 91687955742 is 24755978619.

91687955742 is a `hidden beast` number, since 9 + 1 + 6 + 8 + 79 + 557 + 4 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91687955742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91687955741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25214892 + ... + 25218527.

It is an arithmetic number, because the mean of its divisors is an integer number (8359339365).

Almost surely, 2^91687955742 is an apocalyptic number.

91687955742 is an abundant number, since it is smaller than the sum of its proper divisors (108936189018).

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

91687955742 is a wasteful number, since it uses less digits than its factorization.

91687955742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50433528 (or 50433525 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 63.

The spelling of 91687955742 in words is "ninety-one billion, six hundred eighty-seven million, nine hundred fifty-five thousand, seven hundred forty-two".