6420733218 has 16 divisors (see below), whose sum is σ = 14268296160. Its totient is φ = 2140244388.

The previous prime is 6420733217. The next prime is 6420733223. The reversal of 6420733218 is 8123370246.

It is a happy number.

6420733218 is a `hidden beast` number, since 642 + 0 + 7 + 3 + 3 + 2 + 1 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (6420733217) 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, 59451180 + ... + 59451287.

It is an arithmetic number, because the mean of its divisors is an integer number (891768510).

Almost surely, 2^6420733218 is an apocalyptic number.

6420733218 is an abundant number, since it is smaller than the sum of its proper divisors (7847562942).

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

6420733218 is a wasteful number, since it uses less digits than its factorization.

6420733218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118902478 (or 118902472 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 6420733218 is about 80129.4778343151. The cubic root of 6420733218 is about 1858.6382696919.

The spelling of 6420733218 in words is "six billion, four hundred twenty million, seven hundred thirty-three thousand, two hundred eighteen".