639339933936 has 320 divisors, whose sum is σ = 1994323783680. Its totient is φ = 174098411520.

The previous prime is 639339933931. The next prime is 639339934027.

639339933936 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×639339933936² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639339933931) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127788811 + ... + 127793813.

It is an arithmetic number, because the mean of its divisors is an integer number (6232261824).

Almost surely, 2^639339933936 is an apocalyptic number.

639339933936 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639339933936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997161891840).

639339933936 is an abundant number, since it is smaller than the sum of its proper divisors (1354983849744).

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

639339933936 is a wasteful number, since it uses less digits than its factorization.

639339933936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684 (or 5678 counting only the distinct ones).

The product of its digits is 172186884, while the sum is 66.

The spelling of 639339933936 in words is "six hundred thirty-nine billion, three hundred thirty-nine million, nine hundred thirty-three thousand, nine hundred thirty-six".