6440635 has 8 divisors (see below), whose sum is σ = 7768800. Its totient is φ = 5125824.

The previous prime is 6440587. The next prime is 6440641. The reversal of 6440635 is 5360446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440635 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2242 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (971100).

Almost surely, 2^6440635 is an apocalyptic number.

6440635 is a deficient number, since it is larger than the sum of its proper divisors (1328165).

6440635 is a wasteful number, since it uses less digits than its factorization.

6440635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677.

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

The square root of 6440635 is about 2537.8406175329. The cubic root of 6440635 is about 186.0556641506.

The spelling of 6440635 in words is "six million, four hundred forty thousand, six hundred thirty-five".