639082945 has 16 divisors (see below), whose sum is σ = 804690432. Its totient is φ = 486319680.

The previous prime is 639082901. The next prime is 639082963. The reversal of 639082945 is 549280936.

It is not a de Polignac number, because 639082945 - 2¹³ = 639074753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639082895 and 639082904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5464 + ... + 36166.

It is an arithmetic number, because the mean of its divisors is an integer number (50293152).

Almost surely, 2^639082945 is an apocalyptic number.

It is an amenable number.

639082945 is a deficient number, since it is larger than the sum of its proper divisors (165607487).

639082945 is a wasteful number, since it uses less digits than its factorization.

639082945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30912.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 639082945 is about 25280.0898930364. The cubic root of 639082945 is about 861.3620677768.

The spelling of 639082945 in words is "six hundred thirty-nine million, eighty-two thousand, nine hundred forty-five".