6420881712 has 40 divisors (see below), whose sum is σ = 18956889856. Its totient is φ = 1834537536.

The previous prime is 6420881707. The next prime is 6420881713. The reversal of 6420881712 is 2171880246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6420881713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9554548 + ... + 9555219.

Almost surely, 2^6420881712 is an apocalyptic number.

It is an amenable number.

6420881712 is an abundant number, since it is smaller than the sum of its proper divisors (12536008144).

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

6420881712 is a wasteful number, since it uses less digits than its factorization.

6420881712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19109785 (or 19109779 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 6420881712 is about 80130.4044168005. The cubic root of 6420881712 is about 1858.6525979882.

The spelling of 6420881712 in words is "six billion, four hundred twenty million, eight hundred eighty-one thousand, seven hundred twelve".