6440571 has 12 divisors (see below), whose sum is σ = 9431448. Its totient is φ = 4234464.

The previous prime is 6440561. The next prime is 6440579. The reversal of 6440571 is 1750446.

It is not a de Polignac number, because 6440571 - 2⁷ = 6440443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6440579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4245 + ... + 5558.

It is an arithmetic number, because the mean of its divisors is an integer number (785954).

Almost surely, 2^6440571 is an apocalyptic number.

6440571 is a deficient number, since it is larger than the sum of its proper divisors (2990877).

6440571 is a wasteful number, since it uses less digits than its factorization.

6440571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9882 (or 9879 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 6440571 is about 2537.8280083568. The cubic root of 6440571 is about 186.0550478759.

The spelling of 6440571 in words is "six million, four hundred forty thousand, five hundred seventy-one".