91687745376 has 144 divisors (see below), whose sum is σ = 275801906016. Its totient is φ = 28833159168.

The previous prime is 91687745363. The next prime is 91687745381. The reversal of 91687745376 is 67354778619.

91687745376 is a `hidden beast` number, since 9 + 16 + 87 + 7 + 4 + 537 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388746 + ... + 578358.

It is an arithmetic number, because the mean of its divisors is an integer number (1915291014).

Almost surely, 2^91687745376 is an apocalyptic number.

91687745376 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91687745376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137900953008).

91687745376 is an abundant number, since it is smaller than the sum of its proper divisors (184114160640).

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

91687745376 is a wasteful number, since it uses less digits than its factorization.

91687745376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189725 (or 189714 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 91687745376 in words is "ninety-one billion, six hundred eighty-seven million, seven hundred forty-five thousand, three hundred seventy-six".