9121726872 has 160 divisors (see below), whose sum is σ = 27050760000. Its totient is φ = 2863760832.

The previous prime is 9121726799. The next prime is 9121726879. The reversal of 9121726872 is 2786271219.

It is a happy number.

It is a super-3 number, since 3×9121726872³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9121726879) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2201779 + ... + 2205917.

It is an arithmetic number, because the mean of its divisors is an integer number (169067250).

Almost surely, 2^9121726872 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 9121726872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13525380000).

9121726872 is an abundant number, since it is smaller than the sum of its proper divisors (17929033128).

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

9121726872 is a wasteful number, since it uses less digits than its factorization.

9121726872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355 (or 4342 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 9121726872 is about 95507.7320011317. The cubic root of 9121726872 is about 2089.4197142074.

The spelling of 9121726872 in words is "nine billion, one hundred twenty-one million, seven hundred twenty-six thousand, eight hundred seventy-two".