6639235848 has 128 divisors (see below), whose sum is σ = 21102336000. Its totient is φ = 1894639680.

The previous prime is 6639235847. The next prime is 6639235849. The reversal of 6639235848 is 8485329366.

6639235848 is a `hidden beast` number, since 6 + 6 + 39 + 23 + 584 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (6639235847) and next prime (6639235849).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 6639235794 and 6639235803.

It is not an unprimeable number, because it can be changed into a prime (6639235847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1556743 + ... + 1561001.

It is an arithmetic number, because the mean of its divisors is an integer number (164862000).

Almost surely, 2^6639235848 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 6639235848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10551168000).

6639235848 is an abundant number, since it is smaller than the sum of its proper divisors (14463100152).

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

6639235848 is a wasteful number, since it uses less digits than its factorization.

6639235848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5312 (or 5302 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 6639235848 is about 81481.5061716461. The cubic root of 6639235848 is about 1879.4871703681.

The spelling of 6639235848 in words is "six billion, six hundred thirty-nine million, two hundred thirty-five thousand, eight hundred forty-eight".