639748283822 has 8 divisors (see below), whose sum is σ = 959703599496. Its totient is φ = 319847083992.

The previous prime is 639748283819. The next prime is 639748283827. The reversal of 639748283822 is 228382847936.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639748283827) 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 3 ways as a sum of consecutive naturals, for example, 13499393 + ... + 13546700.

It is an arithmetic number, because the mean of its divisors is an integer number (119962949937).

Almost surely, 2^639748283822 is an apocalyptic number.

639748283822 is a deficient number, since it is larger than the sum of its proper divisors (319955315674).

639748283822 is a wasteful number, since it uses less digits than its factorization.

639748283822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27057922.

The product of its digits is 55738368, while the sum is 62.

The spelling of 639748283822 in words is "six hundred thirty-nine billion, seven hundred forty-eight million, two hundred eighty-three thousand, eight hundred twenty-two".