639729386607 has 8 divisors (see below), whose sum is σ = 853050406576. Its totient is φ = 426447312192.

The previous prime is 639729386591. The next prime is 639729386617. The reversal of 639729386607 is 706683927936.

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

It is not a de Polignac number, because 639729386607 - 2⁴ = 639729386591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639729386617) 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, 9698038 + ... + 9763779.

It is an arithmetic number, because the mean of its divisors is an integer number (106631300822).

Almost surely, 2^639729386607 is an apocalyptic number.

639729386607 is a deficient number, since it is larger than the sum of its proper divisors (213321019969).

639729386607 is a wasteful number, since it uses less digits than its factorization.

639729386607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19472777.

The product of its (nonzero) digits is 123451776, while the sum is 66.

The spelling of 639729386607 in words is "six hundred thirty-nine billion, seven hundred twenty-nine million, three hundred eighty-six thousand, six hundred seven".