6664442 has 16 divisors (see below), whose sum is σ = 10927872. Its totient is φ = 3034560.

The previous prime is 6664429. The next prime is 6664447. The reversal of 6664442 is 2444666.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6664399 and 6664408.

It is not an unprimeable number, because it can be changed into a prime (6664447) 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 7 ways as a sum of consecutive naturals, for example, 2108 + ... + 4215.

It is an arithmetic number, because the mean of its divisors is an integer number (682992).

Almost surely, 2^6664442 is an apocalyptic number.

6664442 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

6664442 is the 2108-th pentagonal number.

6664442 is a deficient number, since it is larger than the sum of its proper divisors (4263430).

6664442 is a wasteful number, since it uses less digits than its factorization.

6664442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373.

The product of its digits is 27648, while the sum is 32.

The square root of 6664442 is about 2581.5580566782. The cubic root of 6664442 is about 188.1862685323.

The spelling of 6664442 in words is "six million, six hundred sixty-four thousand, four hundred forty-two".