639353967040 has 56 divisors (see below), whose sum is σ = 1536690329712. Its totient is φ = 253351464960.

The previous prime is 639353967019. The next prime is 639353967047. The reversal of 639353967040 is 40769353936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639353967047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9302121 + ... + 9370600.

Almost surely, 2^639353967040 is an apocalyptic number.

It is an amenable number.

639353967040 is an abundant number, since it is smaller than the sum of its proper divisors (897336362672).

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

639353967040 is a wasteful number, since it uses less digits than its factorization.

639353967040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18672845 (or 18672835 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 55.

The spelling of 639353967040 in words is "six hundred thirty-nine billion, three hundred fifty-three million, nine hundred sixty-seven thousand, forty".