639717047 has 16 divisors (see below), whose sum is σ = 662860800. Its totient is φ = 617049888.

The previous prime is 639717019. The next prime is 639717079. The reversal of 639717047 is 740717936.

639717047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 639717047 - 2¹⁰ = 639716023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639716989 and 639717007.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1169228 + ... + 1169774.

It is an arithmetic number, because the mean of its divisors is an integer number (41428800).

Almost surely, 2^639717047 is an apocalyptic number.

639717047 is a deficient number, since it is larger than the sum of its proper divisors (23143753).

639717047 is a wasteful number, since it uses less digits than its factorization.

639717047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 639717047 is about 25292.6283134039. The cubic root of 639717047 is about 861.6468565088.

The spelling of 639717047 in words is "six hundred thirty-nine million, seven hundred seventeen thousand, forty-seven".