639862272000 has 1248 divisors, whose sum is σ = 2679078205440. Its totient is φ = 143887564800.

The previous prime is 639862271989. The next prime is 639862272001. The reversal of 639862272000 is 272268936.

639862272000 is a `hidden beast` number, since 639 + 8 + 6 + 2 + 2 + 7 + 2 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639862272001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2677247881 + ... + 2677248119.

It is an arithmetic number, because the mean of its divisors is an integer number (2146697280).

Almost surely, 2^639862272000 is an apocalyptic number.

639862272000 is a gapful number since it is divisible by the number (60) 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 639862272000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339539102720).

639862272000 is an abundant number, since it is smaller than the sum of its proper divisors (2039215933440).

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

639862272000 is a wasteful number, since it uses less digits than its factorization.

639862272000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 639862272000 in words is "six hundred thirty-nine billion, eight hundred sixty-two million, two hundred seventy-two thousand".