91888763904 has 660 divisors, whose sum is σ = 333414442944. Its totient is φ = 25086910464.

The previous prime is 91888763899. The next prime is 91888763971. The reversal of 91888763904 is 40936788819.

91888763904 is a `hidden beast` number, since 91 + 88 + 87 + 6 + 390 + 4 = 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 59 ways as a sum of consecutive naturals, for example, 93477397 + ... + 93478379.

Almost surely, 2^91888763904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91888763904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166707221472).

91888763904 is an abundant number, since it is smaller than the sum of its proper divisors (241525679040).

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

91888763904 is a wasteful number, since it uses less digits than its factorization.

91888763904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1018 counting only the distinct ones).

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

The spelling of 91888763904 in words is "ninety-one billion, eight hundred eighty-eight million, seven hundred sixty-three thousand, nine hundred four".