91168742280 has 768 divisors, whose sum is σ = 365144371200. Its totient is φ = 17786419200.

The previous prime is 91168742267. The next prime is 91168742309. The reversal of 91168742280 is 8224786119.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 137925150 + ... + 137925810.

It is an arithmetic number, because the mean of its divisors is an integer number (475448400).

Almost surely, 2^91168742280 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 91168742280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182572185600).

91168742280 is an abundant number, since it is smaller than the sum of its proper divisors (273975628920).

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

91168742280 is a wasteful number, since it uses less digits than its factorization.

91168742280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 91168742280 in words is "ninety-one billion, one hundred sixty-eight million, seven hundred forty-two thousand, two hundred eighty".