91378440020208 has 320 divisors, whose sum is σ = 269123467852800. Its totient is φ = 26462889492480.

The previous prime is 91378440020191. The next prime is 91378440020221. The reversal of 91378440020208 is 80202004487319.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1640607016 + ... + 1640662712.

It is an arithmetic number, because the mean of its divisors is an integer number (841010837040).

Almost surely, 2^{91378440020208} 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 91378440020208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134561733926400).

91378440020208 is an abundant number, since it is smaller than the sum of its proper divisors (177745027832592).

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

91378440020208 is a wasteful number, since it uses less digits than its factorization.

91378440020208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56840 (or 56834 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 91378440020208 in words is "ninety-one trillion, three hundred seventy-eight billion, four hundred forty million, twenty thousand, two hundred eight".