639764343467936 has 96 divisors (see below), whose sum is σ = 1333728378158400. Its totient is φ = 301240958515200.

The previous prime is 639764343467923. The next prime is 639764343467957.

639764343467936 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593856620 + ... + 594932948.

It is an arithmetic number, because the mean of its divisors is an integer number (13893003939150).

Almost surely, 2^{639764343467936} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639764343467936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666864189079200).

639764343467936 is an abundant number, since it is smaller than the sum of its proper divisors (693964034690464).

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

639764343467936 is a wasteful number, since it uses less digits than its factorization.

639764343467936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082182 (or 1082174 counting only the distinct ones).

The product of its digits is 26665583616, while the sum is 80.

The spelling of 639764343467936 in words is "six hundred thirty-nine trillion, seven hundred sixty-four billion, three hundred forty-three million, four hundred sixty-seven thousand, nine hundred thirty-six".