638467764836 has 24 divisors (see below), whose sum is σ = 1221316294464. Its totient is φ = 289635646880.

The previous prime is 638467764829. The next prime is 638467764859.

638467764836 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14401955 + ... + 14446218.

It is an arithmetic number, because the mean of its divisors is an integer number (50888178936).

Almost surely, 2^638467764836 is an apocalyptic number.

It is an amenable number.

638467764836 is a deficient number, since it is larger than the sum of its proper divisors (582848529628).

638467764836 is a wasteful number, since it uses less digits than its factorization.

638467764836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28848691 (or 28848689 counting only the distinct ones).

The product of its digits is 585252864, while the sum is 68.

The spelling of 638467764836 in words is "six hundred thirty-eight billion, four hundred sixty-seven million, seven hundred sixty-four thousand, eight hundred thirty-six".