91988645336 has 128 divisors (see below), whose sum is σ = 208825344000. Its totient is φ = 37152691200.

The previous prime is 91988645323. The next prime is 91988645341. The reversal of 91988645336 is 63354688919.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59004125 + ... + 59005683.

It is an arithmetic number, because the mean of its divisors is an integer number (1631448000).

Almost surely, 2^91988645336 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 91988645336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104412672000).

91988645336 is an abundant number, since it is smaller than the sum of its proper divisors (116836698664).

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

91988645336 is a wasteful number, since it uses less digits than its factorization.

91988645336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473 (or 2469 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 62.

The spelling of 91988645336 in words is "ninety-one billion, nine hundred eighty-eight million, six hundred forty-five thousand, three hundred thirty-six".