639134648262 has 96 divisors (see below), whose sum is σ = 1590588155520. Its totient is φ = 183437861760.

The previous prime is 639134648221. The next prime is 639134648293. The reversal of 639134648262 is 262846431936.

639134648262 is a `hidden beast` number, since 6 + 39 + 1 + 346 + 4 + 8 + 262 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 639134648199 and 639134648208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16846098 + ... + 16883994.

It is an arithmetic number, because the mean of its divisors is an integer number (16568626620).

Almost surely, 2^639134648262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639134648262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795294077760).

639134648262 is an abundant number, since it is smaller than the sum of its proper divisors (951453507258).

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

639134648262 is a wasteful number, since it uses less digits than its factorization.

639134648262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42418 (or 42415 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The spelling of 639134648262 in words is "six hundred thirty-nine billion, one hundred thirty-four million, six hundred forty-eight thousand, two hundred sixty-two".