639276653886 has 24 divisors (see below), whose sum is σ = 1384468968600. Its totient is φ = 196700508576.

The previous prime is 639276653803. The next prime is 639276653887. The reversal of 639276653886 is 688356672936.

It is a self number, because there is not a number n which added to its sum of digits gives 639276653886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639276653887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315224161 + ... + 315226188.

It is an arithmetic number, because the mean of its divisors is an integer number (57686207025).

Almost surely, 2^639276653886 is an apocalyptic number.

639276653886 is an abundant number, since it is smaller than the sum of its proper divisors (745192314714).

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

639276653886 is a wasteful number, since it uses less digits than its factorization.

639276653886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630450380 (or 630450367 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 69.

The spelling of 639276653886 in words is "six hundred thirty-nine billion, two hundred seventy-six million, six hundred fifty-three thousand, eight hundred eighty-six".