639548501472 has 120 divisors (see below), whose sum is σ = 1889810185032. Its totient is φ = 212172307200.

The previous prime is 639548501453. The next prime is 639548501477. The reversal of 639548501472 is 274105845936.

It is a happy number.

639548501472 is a `hidden beast` number, since 6 + 3 + 9 + 548 + 50 + 1 + 47 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639548501477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37779 + ... + 1131602.

It is a 1-persistent number, because it is pandigital, but 2⋅639548501472 = 1279097002944 is not.

Almost surely, 2^639548501472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639548501472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944905092516).

639548501472 is an abundant number, since it is smaller than the sum of its proper divisors (1250261683560).

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

639548501472 is a wasteful number, since it uses less digits than its factorization.

639548501472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169614 (or 1169597 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 639548501472 in words is "six hundred thirty-nine billion, five hundred forty-eight million, five hundred one thousand, four hundred seventy-two".