6478645 has 8 divisors (see below), whose sum is σ = 7851960. Its totient is φ = 5131200.

The previous prime is 6478631. The next prime is 6478673. The reversal of 6478645 is 5468746.

It can be written as a sum of positive squares in 4 ways, for example, as 3118756 + 3359889 = 1766^2 + 1833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6478645 - 2²¹ = 4381493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6478598 and 6478607.

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 7 ways as a sum of consecutive naturals, for example, 5910 + ... + 6919.

It is an arithmetic number, because the mean of its divisors is an integer number (981495).

Almost surely, 2^6478645 is an apocalyptic number.

It is an amenable number.

6478645 is a deficient number, since it is larger than the sum of its proper divisors (1373315).

6478645 is a wasteful number, since it uses less digits than its factorization.

6478645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12935.

The product of its digits is 161280, while the sum is 40.

The square root of 6478645 is about 2545.3182512212. The cubic root of 6478645 is about 186.4209546981.

The spelling of 6478645 in words is "six million, four hundred seventy-eight thousand, six hundred forty-five".