6396539136 has 288 divisors, whose sum is σ = 19614551040. Its totient is φ = 1844084736.

The previous prime is 6396539129. The next prime is 6396539137. The reversal of 6396539136 is 6319356936.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (6396539137) 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, 28683921 + ... + 28684143.

It is an arithmetic number, because the mean of its divisors is an integer number (68106080).

Almost surely, 2^6396539136 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 6396539136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9807275520).

6396539136 is an abundant number, since it is smaller than the sum of its proper divisors (13218011904).

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

6396539136 is a wasteful number, since it uses less digits than its factorization.

6396539136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 258 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 51.

The square root of 6396539136 is about 79978.3666749953. The cubic root of 6396539136 is about 1856.3008083589.

The spelling of 6396539136 in words is "six billion, three hundred ninety-six million, five hundred thirty-nine thousand, one hundred thirty-six".