639055444200 has 96 divisors (see below), whose sum is σ = 1982980521600. Its totient is φ = 170250600960.

The previous prime is 639055444187. The next prime is 639055444201. The reversal of 639055444200 is 2444550936.

It is not an unprimeable number, because it can be changed into a prime (639055444201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110844 + ... + 1135956.

It is an arithmetic number, because the mean of its divisors is an integer number (20656047100).

Almost surely, 2^639055444200 is an apocalyptic number.

639055444200 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 639055444200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991490260800).

639055444200 is an abundant number, since it is smaller than the sum of its proper divisors (1343925077400).

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

639055444200 is a wasteful number, since it uses less digits than its factorization.

639055444200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026171 (or 1026162 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 639055444200 in words is "six hundred thirty-nine billion, fifty-five million, four hundred forty-four thousand, two hundred".