6669638 has 4 divisors (see below), whose sum is σ = 10004460. Its totient is φ = 3334818.

The previous prime is 6669617. The next prime is 6669643. The reversal of 6669638 is 8369666.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1667408 + ... + 1667411.

It is an arithmetic number, because the mean of its divisors is an integer number (2501115).

Almost surely, 2^6669638 is an apocalyptic number.

6669638 is a deficient number, since it is larger than the sum of its proper divisors (3334822).

6669638 is a wasteful number, since it uses less digits than its factorization.

6669638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334821.

The product of its digits is 279936, while the sum is 44.

The square root of 6669638 is about 2582.5642295982. The cubic root of 6669638 is about 188.2351629403.

The spelling of 6669638 in words is "six million, six hundred sixty-nine thousand, six hundred thirty-eight".