638202836 has 12 divisors (see below), whose sum is σ = 1118761728. Its totient is φ = 318556632.

The previous prime is 638202821. The next prime is 638202863.

It is a happy number.

638202836 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 638202836.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 133556 + ... + 138251.

It is an arithmetic number, because the mean of its divisors is an integer number (93230144).

Almost surely, 2^638202836 is an apocalyptic number.

It is an amenable number.

638202836 is a deficient number, since it is larger than the sum of its proper divisors (480558892).

638202836 is a wasteful number, since it uses less digits than its factorization.

638202836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272398 (or 272396 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 638202836 is about 25262.6767386198. The cubic root of 638202836 is about 860.9664797021.

The spelling of 638202836 in words is "six hundred thirty-eight million, two hundred two thousand, eight hundred thirty-six".