91194860988 has 288 divisors, whose sum is σ = 313084638720. Its totient is φ = 22656775680.

The previous prime is 91194860947. The next prime is 91194860993. The reversal of 91194860988 is 88906849119.

91194860988 is a `hidden beast` number, since 9 + 1 + 19 + 4 + 8 + 609 + 8 + 8 = 666.

It is a super-2 number, since 2×91194860988² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1304820 + ... + 1372932.

It is an arithmetic number, because the mean of its divisors is an integer number (1087099440).

Almost surely, 2^91194860988 is an apocalyptic number.

91194860988 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 91194860988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156542319360).

91194860988 is an abundant number, since it is smaller than the sum of its proper divisors (221889777732).

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

91194860988 is a wasteful number, since it uses less digits than its factorization.

91194860988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68174 (or 68159 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 63.

The spelling of 91194860988 in words is "ninety-one billion, one hundred ninety-four million, eight hundred sixty thousand, nine hundred eighty-eight".