6440013215 has 8 divisors (see below), whose sum is σ = 7728499008. Its totient is φ = 5151688480.

The previous prime is 6440013193. The next prime is 6440013241. The reversal of 6440013215 is 5123100446.

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

It is not a de Polignac number, because 6440013215 - 2²⁰ = 6438964639 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 80810 + ... + 139320.

It is an arithmetic number, because the mean of its divisors is an integer number (966062376).

Almost surely, 2^6440013215 is an apocalyptic number.

6440013215 is a deficient number, since it is larger than the sum of its proper divisors (1288485793).

6440013215 is a wasteful number, since it uses less digits than its factorization.

6440013215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80529.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 6440013215 is about 80249.6929277614. The cubic root of 6440013215 is about 1860.4967662796.

The spelling of 6440013215 in words is "six billion, four hundred forty million, thirteen thousand, two hundred fifteen".