639601607 has 8 divisors (see below), whose sum is σ = 646712976. Its totient is φ = 632500992.

The previous prime is 639601601. The next prime is 639601609. The reversal of 639601607 is 706106936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639601607 - 2¹⁶ = 639536071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639601601) 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, 194993 + ... + 198245.

It is an arithmetic number, because the mean of its divisors is an integer number (80839122).

Almost surely, 2^639601607 is an apocalyptic number.

639601607 is a deficient number, since it is larger than the sum of its proper divisors (7111369).

639601607 is a wasteful number, since it uses less digits than its factorization.

639601607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 639601607 is about 25290.3461225820. The cubic root of 639601607 is about 861.5950239591.

The spelling of 639601607 in words is "six hundred thirty-nine million, six hundred one thousand, six hundred seven".