639193028127 has 8 divisors (see below), whose sum is σ = 856079153664. Its totient is φ = 424217794008.

The previous prime is 639193028119. The next prime is 639193028141. The reversal of 639193028127 is 721820391936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639193028127 - 2³ = 639193028119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639193028127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639193008127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477722073 + ... + 477723410.

It is an arithmetic number, because the mean of its divisors is an integer number (107009894208).

Almost surely, 2^639193028127 is an apocalyptic number.

639193028127 is a deficient number, since it is larger than the sum of its proper divisors (216886125537).

639193028127 is a wasteful number, since it uses less digits than its factorization.

639193028127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955445709.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 639193028127 in words is "six hundred thirty-nine billion, one hundred ninety-three million, twenty-eight thousand, one hundred twenty-seven".