639016036 has 12 divisors (see below), whose sum is σ = 1118852028. Its totient is φ = 319344032.

The previous prime is 639016033. The next prime is 639016057. The reversal of 639016036 is 630610936.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 35331136 + 603684900 = 5944^2 + 24570^2 .

It is a junction number, because it is equal to n+sod(n) for n = 639015992 and 639016010.

It is not an unprimeable number, because it can be changed into a prime (639016033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 32011 + ... + 47986.

It is an arithmetic number, because the mean of its divisors is an integer number (93237669).

Almost surely, 2^639016036 is an apocalyptic number.

It is an amenable number.

639016036 is a deficient number, since it is larger than the sum of its proper divisors (479835992).

639016036 is a wasteful number, since it uses less digits than its factorization.

639016036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81998 (or 81996 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 639016036 is about 25278.7665047170. The cubic root of 639016036 is about 861.3320065323.

The spelling of 639016036 in words is "six hundred thirty-nine million, sixteen thousand, thirty-six".