6404725 has 6 divisors (see below), whose sum is σ = 7941890. Its totient is φ = 5123760.

The previous prime is 6404719. The next prime is 6404743. The reversal of 6404725 is 5274046.

It can be written as a sum of positive squares in 3 ways, for example, as 49284 + 6355441 = 222^2 + 2521^2 .

It is not a de Polignac number, because 6404725 - 2¹⁹ = 5880437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6404693 and 6404702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128070 + ... + 128119.

Almost surely, 2^6404725 is an apocalyptic number.

It is an amenable number.

6404725 is a deficient number, since it is larger than the sum of its proper divisors (1537165).

6404725 is a wasteful number, since it uses less digits than its factorization.

6404725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256199 (or 256194 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 6404725 is about 2530.7558159570. The cubic root of 6404725 is about 185.7092327450.

The spelling of 6404725 in words is "six million, four hundred four thousand, seven hundred twenty-five".