6404028 has 24 divisors (see below), whose sum is σ = 15593088. Its totient is φ = 2041776.

The previous prime is 6404023. The next prime is 6404059. The reversal of 6404028 is 8204046.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6403989 and 6404007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11326 + ... + 11877.

It is an arithmetic number, because the mean of its divisors is an integer number (649712).

Almost surely, 2^6404028 is an apocalyptic number.

It is an amenable number.

6404028 is an abundant number, since it is smaller than the sum of its proper divisors (9189060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6404028 is a wasteful number, since it uses less digits than its factorization.

6404028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23233 (or 23231 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 6404028 is about 2530.6181063132. The cubic root of 6404028 is about 185.7024958421.

The spelling of 6404028 in words is "six million, four hundred four thousand, twenty-eight".