6402181312 has 56 divisors (see below), whose sum is σ = 12956572512. Its totient is φ = 3137894400.

The previous prime is 6402181297. The next prime is 6402181343. The reversal of 6402181312 is 2131812046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1211508 + ... + 1216780.

Almost surely, 2^6402181312 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 6402181312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6478286256).

6402181312 is an abundant number, since it is smaller than the sum of its proper divisors (6554391200).

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

6402181312 is a wasteful number, since it uses less digits than its factorization.

6402181312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5657 (or 5647 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 6402181312 is about 80013.6320385470. The cubic root of 6402181312 is about 1856.8464418486.

Adding to 6402181312 its reverse (2131812046), we get a palindrome (8533993358).

The spelling of 6402181312 in words is "six billion, four hundred two million, one hundred eighty-one thousand, three hundred twelve".