6440567 has 8 divisors (see below), whose sum is σ = 7540512. Its totient is φ = 5385600.

The previous prime is 6440561. The next prime is 6440579. The reversal of 6440567 is 7650446.

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

It is a cyclic number.

It is not a de Polignac number, because 6440567 - 2⁸ = 6440311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440561) 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, 10934 + ... + 11507.

It is an arithmetic number, because the mean of its divisors is an integer number (942564).

Almost surely, 2^6440567 is an apocalyptic number.

6440567 is a deficient number, since it is larger than the sum of its proper divisors (1099945).

6440567 is a wasteful number, since it uses less digits than its factorization.

6440567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22489.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 6440567 is about 2537.8272202812. The cubic root of 6440567 is about 186.0550093586.

It can be divided in two parts, 6440 and 567, that added together give a palindrome (7007).

The spelling of 6440567 in words is "six million, four hundred forty thousand, five hundred sixty-seven".