6428480639 has 4 divisors (see below), whose sum is σ = 7346835024. Its totient is φ = 5510126256.

The previous prime is 6428480629. The next prime is 6428480647. The reversal of 6428480639 is 9360848246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6428480639 - 2²⁴ = 6411703423 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 (6428480609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459177182 + ... + 459177195.

It is an arithmetic number, because the mean of its divisors is an integer number (1836708756).

Almost surely, 2^6428480639 is an apocalyptic number.

6428480639 is a deficient number, since it is larger than the sum of its proper divisors (918354385).

6428480639 is an equidigital number, since it uses as much as digits as its factorization.

6428480639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918354384.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The square root of 6428480639 is about 80177.8063992774. The cubic root of 6428480639 is about 1859.3855293838.

The spelling of 6428480639 in words is "six billion, four hundred twenty-eight million, four hundred eighty thousand, six hundred thirty-nine".