91397808684 has 108 divisors (see below), whose sum is σ = 285911227056. Its totient is φ = 24104905344.

The previous prime is 91397808643. The next prime is 91397808701. The reversal of 91397808684 is 48680879319.

91397808684 is a `hidden beast` number, since 91 + 397 + 8 + 0 + 86 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1030459 + ... + 1115634.

Almost surely, 2^91397808684 is an apocalyptic number.

It is an amenable number.

91397808684 is an abundant number, since it is smaller than the sum of its proper divisors (194513418372).

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

91397808684 is a wasteful number, since it uses less digits than its factorization.

91397808684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146136 (or 2146118 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 91397808684 in words is "ninety-one billion, three hundred ninety-seven million, eight hundred eight thousand, six hundred eighty-four".