91887898368 has 216 divisors, whose sum is σ = 296854927488. Its totient is φ = 25111984128.

The previous prime is 91887898327. The next prime is 91887898397. The reversal of 91887898368 is 86389878819.

It is a self number, because there is not a number n which added to its sum of digits gives 91887898368.

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, 812455 + ... + 918617.

It is an arithmetic number, because the mean of its divisors is an integer number (1374328368).

Almost surely, 2^91887898368 is an apocalyptic number.

91887898368 is a gapful number since it is divisible by the number (98) 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 91887898368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148427463744).

91887898368 is an abundant number, since it is smaller than the sum of its proper divisors (204967029120).

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

91887898368 is a wasteful number, since it uses less digits than its factorization.

91887898368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106219 (or 106198 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 75.

The spelling of 91887898368 in words is "ninety-one billion, eight hundred eighty-seven million, eight hundred ninety-eight thousand, three hundred sixty-eight".