6340645 has 8 divisors (see below), whose sum is σ = 7733880. Its totient is φ = 4989120.

The previous prime is 6340637. The next prime is 6340657. The reversal of 6340645 is 5460436.

6340645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 352836 + 5987809 = 594^2 + 2447^2 .

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

It is not a de Polignac number, because 6340645 - 2³ = 6340637 is a prime.

It is an Ulam number.

6340645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10090 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (966735).

Almost surely, 2^6340645 is an apocalyptic number.

It is an amenable number.

6340645 is a deficient number, since it is larger than the sum of its proper divisors (1393235).

6340645 is a wasteful number, since it uses less digits than its factorization.

6340645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20855.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6340645 is about 2518.0637402576. The cubic root of 6340645 is about 185.0878083283.

The spelling of 6340645 in words is "six million, three hundred forty thousand, six hundred forty-five".