639828572 has 12 divisors (see below), whose sum is σ = 1178631720. Its totient is φ = 303076656.

The previous prime is 639828571. The next prime is 639828577. The reversal of 639828572 is 275828936.

It is a self number, because there is not a number n which added to its sum of digits gives 639828572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639828571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4209323 + ... + 4209474.

It is an arithmetic number, because the mean of its divisors is an integer number (98219310).

Almost surely, 2^639828572 is an apocalyptic number.

It is an amenable number.

639828572 is a deficient number, since it is larger than the sum of its proper divisors (538803148).

639828572 is a wasteful number, since it uses less digits than its factorization.

639828572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418820 (or 8418818 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 639828572 is about 25294.8329110908. The cubic root of 639828572 is about 861.6969253022.

The spelling of 639828572 in words is "six hundred thirty-nine million, eight hundred twenty-eight thousand, five hundred seventy-two".