6642447 has 16 divisors (see below), whose sum is σ = 10275072. Its totient is φ = 3738240.

The previous prime is 6642439. The next prime is 6642487. The reversal of 6642447 is 7442466.

It is not a de Polignac number, because 6642447 - 2³ = 6642439 is a prime.

6642447 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954 + ... + 3767.

It is an arithmetic number, because the mean of its divisors is an integer number (642192).

Almost surely, 2^6642447 is an apocalyptic number.

6642447 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6642447 is a deficient number, since it is larger than the sum of its proper divisors (3632625).

6642447 is a wasteful number, since it uses less digits than its factorization.

6642447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798.

The product of its digits is 32256, while the sum is 33.

The square root of 6642447 is about 2577.2945116924. The cubic root of 6642447 is about 187.9790134262.

The spelling of 6642447 in words is "six million, six hundred forty-two thousand, four hundred forty-seven".