638363836 has 24 divisors (see below), whose sum is σ = 1220418864. Its totient is φ = 289754880.

The previous prime is 638363801. The next prime is 638363851.

638363836 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×638363836² = 815016774225269792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

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 7 ways as a sum of consecutive naturals, for example, 22356 + ... + 42148.

It is an arithmetic number, because the mean of its divisors is an integer number (50850786).

Almost surely, 2^638363836 is an apocalyptic number.

It is an amenable number.

638363836 is a deficient number, since it is larger than the sum of its proper divisors (582055028).

638363836 is a wasteful number, since it uses less digits than its factorization.

638363836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20541 (or 20539 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 46.

The square root of 638363836 is about 25265.8630567016. The cubic root of 638363836 is about 861.0388725428.

The spelling of 638363836 in words is "six hundred thirty-eight million, three hundred sixty-three thousand, eight hundred thirty-six".