639548470080 has 672 divisors, whose sum is σ = 2594916324000. Its totient is φ = 143053553664.

The previous prime is 639548470031. The next prime is 639548470087. The reversal of 639548470080 is 80074845936.

639548470080 is a `hidden beast` number, since 6 + 3 + 95 + 4 + 8 + 470 + 0 + 80 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 248793459264 + 390755010816 = 498792^2 + 625104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 639548469999 and 639548470026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639548470087) 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, 18440596 + ... + 18475244.

It is an arithmetic number, because the mean of its divisors is an integer number (3861482625).

Almost surely, 2^639548470080 is an apocalyptic number.

639548470080 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 639548470080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1297458162000).

639548470080 is an abundant number, since it is smaller than the sum of its proper divisors (1955367853920).

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

639548470080 is a wasteful number, since it uses less digits than its factorization.

639548470080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34731 (or 34718 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 639548470080 in words is "six hundred thirty-nine billion, five hundred forty-eight million, four hundred seventy thousand, eighty".