6442689 has 16 divisors (see below), whose sum is σ = 9468864. Its totient is φ = 3864000.

The previous prime is 6442679. The next prime is 6442697. The reversal of 6442689 is 9862446.

It is not a de Polignac number, because 6442689 - 2⁴ = 6442673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6442679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2367 + ... + 4299.

It is an arithmetic number, because the mean of its divisors is an integer number (591804).

Almost surely, 2^6442689 is an apocalyptic number.

It is an amenable number.

6442689 is a deficient number, since it is larger than the sum of its proper divisors (3026175).

6442689 is a wasteful number, since it uses less digits than its factorization.

6442689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048.

The product of its digits is 82944, while the sum is 39.

The square root of 6442689 is about 2538.2452600172. The cubic root of 6442689 is about 186.0754405503.

It can be divided in two parts, 644 and 2689, that added together give a palindrome (3333).

The spelling of 6442689 in words is "six million, four hundred forty-two thousand, six hundred eighty-nine".