6444685 has 8 divisors (see below), whose sum is σ = 8328600. Its totient is φ = 4759104.

The previous prime is 6444679. The next prime is 6444689. The reversal of 6444685 is 5864446.

It can be written as a sum of positive squares in 4 ways, for example, as 544644 + 5900041 = 738^2 + 2429^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6444685 - 2³ = 6444677 is a prime.

6444685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49510 + ... + 49639.

It is an arithmetic number, because the mean of its divisors is an integer number (1041075).

Almost surely, 2^6444685 is an apocalyptic number.

6444685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6444685 is a deficient number, since it is larger than the sum of its proper divisors (1883915).

6444685 is a wasteful number, since it uses less digits than its factorization.

6444685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99167.

The product of its digits is 92160, while the sum is 37.

The square root of 6444685 is about 2538.6384145837. The cubic root of 6444685 is about 186.0946544857.

It can be divided in two parts, 644 and 4685, that added together give a square (5329 = 73²).

The spelling of 6444685 in words is "six million, four hundred forty-four thousand, six hundred eighty-five".