6428809 has 2 divisors, whose sum is σ = 6428810. Its totient is φ = 6428808.

The previous prime is 6428803. The next prime is 6428813. The reversal of 6428809 is 9088246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 38025 = 2528^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428809 - 2⁵ = 6428777 is a prime.

It is not a weakly prime, because it can be changed into another prime (6428803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214404 + 3214405.

It is an arithmetic number, because the mean of its divisors is an integer number (3214405).

Almost surely, 2^6428809 is an apocalyptic number.

It is an amenable number.

6428809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6428809 is an equidigital number, since it uses as much as digits as its factorization.

6428809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 6428809 is about 2535.5096134702. The cubic root of 6428809 is about 185.9417187424.

The spelling of 6428809 in words is "six million, four hundred twenty-eight thousand, eight hundred nine".