639436634936 has 32 divisors (see below), whose sum is σ = 1308192439680. Its totient is φ = 290596600800.

The previous prime is 639436634933. The next prime is 639436634981.

639436634936 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639436634933) 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, 247556 + ... + 1157651.

It is an arithmetic number, because the mean of its divisors is an integer number (40881013740).

Almost surely, 2^639436634936 is an apocalyptic number.

It is an amenable number.

639436634936 is an abundant number, since it is smaller than the sum of its proper divisors (668755804744).

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

639436634936 is a wasteful number, since it uses less digits than its factorization.

639436634936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410395 (or 1410391 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 62.

The spelling of 639436634936 in words is "six hundred thirty-nine billion, four hundred thirty-six million, six hundred thirty-four thousand, nine hundred thirty-six".