6428321 has 4 divisors (see below), whose sum is σ = 6433812. Its totient is φ = 6422832.

The previous prime is 6428311. The next prime is 6428353. The reversal of 6428321 is 1238246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 5499025 = 964^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428321 - 2²² = 2234017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6428311) 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, 206 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (1608453).

Almost surely, 2^6428321 is an apocalyptic number.

It is an amenable number.

6428321 is a deficient number, since it is larger than the sum of its proper divisors (5491).

6428321 is a wasteful number, since it uses less digits than its factorization.

6428321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490.

The product of its digits is 2304, while the sum is 26.

The square root of 6428321 is about 2535.4133785243. The cubic root of 6428321 is about 185.9370137831.

The spelling of 6428321 in words is "six million, four hundred twenty-eight thousand, three hundred twenty-one".