6438789516 has 12 divisors (see below), whose sum is σ = 15023842232. Its totient is φ = 2146263168.

The previous prime is 6438789509. The next prime is 6438789523. The reversal of 6438789516 is 6159878346.

It is an interprime number because it is at equal distance from previous prime (6438789509) and next prime (6438789523).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268282885 + ... + 268282908.

Almost surely, 2^6438789516 is an apocalyptic number.

It is an amenable number.

6438789516 is an abundant number, since it is smaller than the sum of its proper divisors (8585052716).

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

6438789516 is a wasteful number, since it uses less digits than its factorization.

6438789516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536565800 (or 536565798 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 57.

The square root of 6438789516 is about 80242.0682435342. The cubic root of 6438789516 is about 1860.3789180614.

The spelling of 6438789516 in words is "six billion, four hundred thirty-eight million, seven hundred eighty-nine thousand, five hundred sixteen".