6427218789 has 12 divisors (see below), whose sum is σ = 9410936236. Its totient is φ = 4226116032.

The previous prime is 6427218769. The next prime is 6427218799. The reversal of 6427218789 is 9878127246.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1915812900 + 4511405889 = 43770^2 + 67167^2 .

It is not a de Polignac number, because 6427218789 - 2²⁵ = 6393664357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6427218709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4890682 + ... + 4891995.

Almost surely, 2^6427218789 is an apocalyptic number.

It is an amenable number.

6427218789 is a deficient number, since it is larger than the sum of its proper divisors (2983717447).

6427218789 is a wasteful number, since it uses less digits than its factorization.

6427218789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782756 (or 9782753 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 6427218789 is about 80169.9369402272. The cubic root of 6427218789 is about 1859.2638614866.

The spelling of 6427218789 in words is "six billion, four hundred twenty-seven million, two hundred eighteen thousand, seven hundred eighty-nine".