639066 has 16 divisors (see below), whose sum is σ = 1308384. Its totient is φ = 207984.

The previous prime is 639053. The next prime is 639083. The reversal of 639066 is 660936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (81774).

2⁶³⁹⁰⁶⁶ is an apocalyptic number.

639066 is an abundant number, since it is smaller than the sum of its proper divisors (669318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639066 is a wasteful number, since it uses less digits than its factorization.

639066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 639066 is about 799.4160368669. The cubic root of 639066 is about 86.1354454832.

The spelling of 639066 in words is "six hundred thirty-nine thousand, sixty-six".