8428004 has 24 divisors (see below), whose sum is σ = 16150008. Its totient is φ = 3824640.

The previous prime is 8428003. The next prime is 8428031. The reversal of 8428004 is 4008248.

8428004 = 117² + 118² + ... + 299².

It can be written as a sum of positive squares in 4 ways, for example, as 6400 + 8421604 = 80^2 + 2902^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428003) 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, 1844 + ... + 4500.

It is an arithmetic number, because the mean of its divisors is an integer number (672917).

Almost surely, 2^8428004 is an apocalyptic number.

It is an amenable number.

8428004 is a deficient number, since it is larger than the sum of its proper divisors (7722004).

8428004 is a wasteful number, since it uses less digits than its factorization.

8428004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735 (or 2733 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 8428004 is about 2903.1024783841. The cubic root of 8428004 is about 203.5049189167.

The spelling of 8428004 in words is "eight million, four hundred twenty-eight thousand, four".