2171372928 has 128 divisors (see below), whose sum is σ = 6082007040. Its totient is φ = 685363200.

The previous prime is 2171372899. The next prime is 2171372933. The reversal of 2171372928 is 8292731712.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 2171372928.

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, 557548 + ... + 561428.

It is an arithmetic number, because the mean of its divisors is an integer number (47515680).

Almost surely, 2^2171372928 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 2171372928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3041003520).

2171372928 is an abundant number, since it is smaller than the sum of its proper divisors (3910634112).

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

2171372928 is a wasteful number, since it uses less digits than its factorization.

2171372928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976 (or 3964 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 2171372928 is about 46597.9927464692. The cubic root of 2171372928 is about 1294.9255688849.

The spelling of 2171372928 in words is "two billion, one hundred seventy-one million, three hundred seventy-two thousand, nine hundred twenty-eight".