639717027 has 8 divisors (see below), whose sum is σ = 854457360. Its totient is φ = 425727360.

The previous prime is 639717019. The next prime is 639717079. The reversal of 639717027 is 720717936.

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

It is not a de Polignac number, because 639717027 - 2³ = 639717019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639717027.

It is not an unprimeable number, because it can be changed into a prime (639717017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185674 + ... + 189087.

It is an arithmetic number, because the mean of its divisors is an integer number (106807170).

Almost surely, 2^639717027 is an apocalyptic number.

639717027 is a deficient number, since it is larger than the sum of its proper divisors (214740333).

639717027 is a wasteful number, since it uses less digits than its factorization.

639717027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375333.

The product of its (nonzero) digits is 111132, while the sum is 42.

The square root of 639717027 is about 25292.6279180318. The cubic root of 639717027 is about 861.6468475293.

The spelling of 639717027 in words is "six hundred thirty-nine million, seven hundred seventeen thousand, twenty-seven".