6840021288 has 96 divisors (see below), whose sum is σ = 17922617280. Its totient is φ = 2174860800.

The previous prime is 6840021173. The next prime is 6840021311. The reversal of 6840021288 is 8821200486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1635456 + ... + 1639632.

It is an arithmetic number, because the mean of its divisors is an integer number (186693930).

Almost surely, 2^6840021288 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 6840021288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8961308640).

6840021288 is an abundant number, since it is smaller than the sum of its proper divisors (11082595992).

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

6840021288 is a wasteful number, since it uses less digits than its factorization.

6840021288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319 (or 4284 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 6840021288 is about 82704.4212119280. The cubic root of 6840021288 is about 1898.2459608932.

The spelling of 6840021288 in words is "six billion, eight hundred forty million, twenty-one thousand, two hundred eighty-eight".