6440294217 has 8 divisors (see below), whose sum is σ = 9813781696. Its totient is φ = 3680168112.

The previous prime is 6440294213. The next prime is 6440294243. The reversal of 6440294217 is 7124920446.

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

It is not a de Polignac number, because 6440294217 - 2² = 6440294213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440294213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153340318 + ... + 153340359.

It is an arithmetic number, because the mean of its divisors is an integer number (1226722712).

Almost surely, 2^6440294217 is an apocalyptic number.

It is an amenable number.

6440294217 is a deficient number, since it is larger than the sum of its proper divisors (3373487479).

6440294217 is a wasteful number, since it uses less digits than its factorization.

6440294217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306680687.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 6440294217 is about 80251.4437066399. The cubic root of 6440294217 is about 1860.5238260434.

The spelling of 6440294217 in words is "six billion, four hundred forty million, two hundred ninety-four thousand, two hundred seventeen".