639322028667 has 48 divisors (see below), whose sum is σ = 1059632271360. Its totient is φ = 363858868800.

The previous prime is 639322028647. The next prime is 639322028671. The reversal of 639322028667 is 766820223936.

639322028667 is a `hidden beast` number, since 6 + 39 + 322 + 0 + 286 + 6 + 7 = 666.

It is not a de Polignac number, because 639322028667 - 2¹⁴ = 639322012283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639322028617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91866334 + ... + 91873292.

It is an arithmetic number, because the mean of its divisors is an integer number (22075672320).

Almost surely, 2^639322028667 is an apocalyptic number.

639322028667 is a deficient number, since it is larger than the sum of its proper divisors (420310242693).

639322028667 is a wasteful number, since it uses less digits than its factorization.

639322028667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12624 (or 12621 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 639322028667 in words is "six hundred thirty-nine billion, three hundred twenty-two million, twenty-eight thousand, six hundred sixty-seven".