9926821872 has 180 divisors, whose sum is σ = 30976349976. Its totient is φ = 2943087360.

The previous prime is 9926821859. The next prime is 9926821901. The reversal of 9926821872 is 2781286299.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3497638 + ... + 3500474.

Almost surely, 2^9926821872 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 9926821872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15488174988).

9926821872 is an abundant number, since it is smaller than the sum of its proper divisors (21049528104).

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

9926821872 is a wasteful number, since it uses less digits than its factorization.

9926821872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956 (or 2900 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 9926821872 is about 99633.4375197403. The cubic root of 9926821872 is about 2149.1665687658.

The spelling of 9926821872 in words is "nine billion, nine hundred twenty-six million, eight hundred twenty-one thousand, eight hundred seventy-two".