639763367936 has 144 divisors (see below), whose sum is σ = 1623347172720. Its totient is φ = 249258024960.

The previous prime is 639763367923. The next prime is 639763367941.

It is a happy number.

639763367936 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814091 + ... + 1393653.

It is an arithmetic number, because the mean of its divisors is an integer number (11273244255).

Almost surely, 2^639763367936 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 639763367936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811673586360).

639763367936 is an abundant number, since it is smaller than the sum of its proper divisors (983583804784).

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

639763367936 is a wasteful number, since it uses less digits than its factorization.

639763367936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579610 (or 579583 counting only the distinct ones).

The product of its digits is 416649744, while the sum is 68.

The spelling of 639763367936 in words is "six hundred thirty-nine billion, seven hundred sixty-three million, three hundred sixty-seven thousand, nine hundred thirty-six".