6428789 has 2 divisors, whose sum is σ = 6428790. Its totient is φ = 6428788.

The previous prime is 6428777. The next prime is 6428791. The reversal of 6428789 is 9878246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 27889 = 2530^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428789 - 2²⁰ = 5380213 is a prime.

Together with 6428791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6428189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214394 + 3214395.

It is an arithmetic number, because the mean of its divisors is an integer number (3214395).

Almost surely, 2^6428789 is an apocalyptic number.

It is an amenable number.

6428789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6428789 is an equidigital number, since it uses as much as digits as its factorization.

6428789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 6428789 is about 2535.5056694869. The cubic root of 6428789 is about 185.9415259209.

The spelling of 6428789 in words is "six million, four hundred twenty-eight thousand, seven hundred eighty-nine".