639285706 has 8 divisors (see below), whose sum is σ = 959063364. Its totient is φ = 319597920.

The previous prime is 639285679. The next prime is 639285707. The reversal of 639285706 is 607582936.

639285706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 441630225 + 197655481 = 21015^2 + 14059^2 .

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

It is not an unprimeable number, because it can be changed into a prime (639285707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315 + ... + 35758.

Almost surely, 2^639285706 is an apocalyptic number.

639285706 is a deficient number, since it is larger than the sum of its proper divisors (319777658).

639285706 is a wasteful number, since it uses less digits than its factorization.

639285706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44936.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 639285706 is about 25284.0998653304. The cubic root of 639285706 is about 861.4531525457.

The spelling of 639285706 in words is "six hundred thirty-nine million, two hundred eighty-five thousand, seven hundred six".