91309267672 has 64 divisors (see below), whose sum is σ = 199895040000. Its totient is φ = 38286658176.

The previous prime is 91309267667. The next prime is 91309267711. The reversal of 91309267672 is 27676290319.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12627354 + ... + 12634582.

It is an arithmetic number, because the mean of its divisors is an integer number (3123360000).

Almost surely, 2^91309267672 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 91309267672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99947520000).

91309267672 is an abundant number, since it is smaller than the sum of its proper divisors (108585772328).

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

91309267672 is a wasteful number, since it uses less digits than its factorization.

91309267672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12088 (or 12084 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 52.

The spelling of 91309267672 in words is "ninety-one billion, three hundred nine million, two hundred sixty-seven thousand, six hundred seventy-two".