9927131872 has 72 divisors (see below), whose sum is σ = 22753006920. Its totient is φ = 4251098880.

The previous prime is 9927131777. The next prime is 9927131881. The reversal of 9927131872 is 2781317299.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3732079 + ... + 3734737.

It is an arithmetic number, because the mean of its divisors is an integer number (316013985).

Almost surely, 2^9927131872 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 9927131872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11376503460).

9927131872 is an abundant number, since it is smaller than the sum of its proper divisors (12825875048).

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

9927131872 is a wasteful number, since it uses less digits than its factorization.

9927131872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064 (or 5049 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 9927131872 is about 99634.9932102171. The cubic root of 9927131872 is about 2149.1889402999.

The spelling of 9927131872 in words is "nine billion, nine hundred twenty-seven million, one hundred thirty-one thousand, eight hundred seventy-two".