639088 has 20 divisors (see below), whose sum is σ = 1261080. Its totient is φ = 313664.

The previous prime is 639083. The next prime is 639091. The reversal of 639088 is 880936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639083) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 606 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (63054).

2⁶³⁹⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

639088 is a deficient number, since it is larger than the sum of its proper divisors (621992).

639088 is a wasteful number, since it uses less digits than its factorization.

639088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 639088 is about 799.4297967927. The cubic root of 639088 is about 86.1364338830.

The spelling of 639088 in words is "six hundred thirty-nine thousand, eighty-eight".