639085275 has 48 divisors (see below), whose sum is σ = 1205800800. Its totient is φ = 331620480.

The previous prime is 639085261. The next prime is 639085313. The reversal of 639085275 is 572580936.

It is a happy number.

639085275 is a `hidden beast` number, since 639 + 0 + 8 + 5 + 2 + 7 + 5 = 666.

It is not a de Polignac number, because 639085275 - 2⁷ = 639085147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 639085275.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12181 + ... + 37769.

It is an arithmetic number, because the mean of its divisors is an integer number (25120850).

Almost surely, 2^639085275 is an apocalyptic number.

639085275 is a deficient number, since it is larger than the sum of its proper divisors (566715525).

639085275 is a wasteful number, since it uses less digits than its factorization.

639085275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25645 (or 25634 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 639085275 is about 25280.1359766913. The cubic root of 639085275 is about 861.3631145743.

The spelling of 639085275 in words is "six hundred thirty-nine million, eighty-five thousand, two hundred seventy-five".