9724139320672 has 96 divisors (see below), whose sum is σ = 22220615208960. Its totient is φ = 4102928363520.

The previous prime is 9724139320633. The next prime is 9724139320751. The reversal of 9724139320672 is 2760239314279.

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, 2978479 + ... + 5321617.

It is an arithmetic number, because the mean of its divisors is an integer number (231464741760).

Almost surely, 2^{9724139320672} 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 9724139320672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11110307604480).

9724139320672 is an abundant number, since it is smaller than the sum of its proper divisors (12496475888288).

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

9724139320672 is a wasteful number, since it uses less digits than its factorization.

9724139320672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343444 (or 2343436 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 9724139320672 in words is "nine trillion, seven hundred twenty-four billion, one hundred thirty-nine million, three hundred twenty thousand, six hundred seventy-two".