6647390 has 8 divisors (see below), whose sum is σ = 11965320. Its totient is φ = 2658952.

The previous prime is 6647369. The next prime is 6647393. The reversal of 6647390 is 937466.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6647390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332360 + ... + 332379.

It is an arithmetic number, because the mean of its divisors is an integer number (1495665).

Almost surely, 2^6647390 is an apocalyptic number.

6647390 is a deficient number, since it is larger than the sum of its proper divisors (5317930).

6647390 is a wasteful number, since it uses less digits than its factorization.

6647390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664746.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6647390 is about 2578.2532846871. The cubic root of 6647390 is about 188.0256302766.

The spelling of 6647390 in words is "six million, six hundred forty-seven thousand, three hundred ninety".