639064 has 32 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 290304.

The previous prime is 639053. The next prime is 639083. The reversal of 639064 is 460936.

639064 = T₅₇ + T₅₈ + ... + T₁₅₈.

It is an Ulam number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4969 + ... + 5095.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁶³⁹⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

639064 is an abundant number, since it is smaller than the sum of its proper divisors (674216).

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

639064 is a wasteful number, since it uses less digits than its factorization.

639064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 639064 is about 799.4147859528. The cubic root of 639064 is about 86.1353556276.

The spelling of 639064 in words is "six hundred thirty-nine thousand, sixty-four".