638824117206 has 16 divisors (see below), whose sum is σ = 1393798074048. Its totient is φ = 193583065800.

The previous prime is 638824117201. The next prime is 638824117219. The reversal of 638824117206 is 602711428836.

It is a super-3 number, since 3×638824117206³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638824117201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4839576580 + ... + 4839576711.

It is an arithmetic number, because the mean of its divisors is an integer number (87112379628).

Almost surely, 2^638824117206 is an apocalyptic number.

638824117206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

638824117206 is an abundant number, since it is smaller than the sum of its proper divisors (754973956842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638824117206 is a wasteful number, since it uses less digits than its factorization.

638824117206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9679153307.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 638824117206 in words is "six hundred thirty-eight billion, eight hundred twenty-four million, one hundred seventeen thousand, two hundred six".