639552 has 28 divisors (see below), whose sum is σ = 1692656. Its totient is φ = 213120.

The previous prime is 639547. The next prime is 639563. The reversal of 639552 is 255936.

It is an unprimeable number.

639552 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1474 + ... + 1857.

It is an arithmetic number, because the mean of its divisors is an integer number (60452).

2⁶³⁹⁵⁵² is an apocalyptic number.

It is an amenable number.

639552 is an abundant number, since it is smaller than the sum of its proper divisors (1053104).

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

639552 is a wasteful number, since it uses less digits than its factorization.

639552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346 (or 3336 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 639552 is about 799.7199509828. The cubic root of 639552 is about 86.1572748505.

The spelling of 639552 in words is "six hundred thirty-nine thousand, five hundred fifty-two".