6428 has 6 divisors (see below), whose sum is σ = 11256. Its totient is φ = 3212.

The previous prime is 6427. The next prime is 6449. The reversal of 6428 is 8246.

6428 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800 + ... + 807.

It is an arithmetic number, because the mean of its divisors is an integer number (1876).

2⁶⁴²⁸ is an apocalyptic number.

It is an amenable number.

6428 is a deficient number, since it is larger than the sum of its proper divisors (4828).

6428 is a wasteful number, since it uses less digits than its factorization.

6428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1609 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 6428 is about 80.1748090113. The cubic root of 6428 is about 18.5933918793.

It can be divided in two parts, 6 and 428, that added together give a palindrome (434).

The spelling of 6428 in words is "six thousand, four hundred twenty-eight".