91230018491728 has 160 divisors (see below), whose sum is σ = 188894142001152. Its totient is φ = 42535342080000.

The previous prime is 91230018491693. The next prime is 91230018491789. The reversal of 91230018491728 is 82719481003219.

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, 11261570878 + ... + 11261578978.

Almost surely, 2^{91230018491728} 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 91230018491728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94447071000576).

91230018491728 is an abundant number, since it is smaller than the sum of its proper divisors (97664123509424).

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

91230018491728 is a wasteful number, since it uses less digits than its factorization.

91230018491728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9213 (or 9207 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 91230018491728 in words is "ninety-one trillion, two hundred thirty billion, eighteen million, four hundred ninety-one thousand, seven hundred twenty-eight".