639527637272 has 32 divisors (see below), whose sum is σ = 1217090683200. Its totient is φ = 314970742944.

The previous prime is 639527637271. The next prime is 639527637299. The reversal of 639527637272 is 272736725936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639527637271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11302283 + ... + 11358725.

It is an arithmetic number, because the mean of its divisors is an integer number (38034083850).

Almost surely, 2^639527637272 is an apocalyptic number.

It is an amenable number.

639527637272 is a deficient number, since it is larger than the sum of its proper divisors (577563045928).

639527637272 is a wasteful number, since it uses less digits than its factorization.

639527637272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77655 (or 77651 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 59.

The spelling of 639527637272 in words is "six hundred thirty-nine billion, five hundred twenty-seven million, six hundred thirty-seven thousand, two hundred seventy-two".