639086045 has 8 divisors (see below), whose sum is σ = 825895896. Its totient is φ = 471940416.

The previous prime is 639086023. The next prime is 639086051. The reversal of 639086045 is 540680936.

It can be written as a sum of positive squares in 4 ways, for example, as 30625156 + 608460889 = 5534^2 + 24667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639086045 - 2¹⁸ = 638823901 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639085993 and 639086011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4915982 + ... + 4916111.

It is an arithmetic number, because the mean of its divisors is an integer number (103236987).

Almost surely, 2^639086045 is an apocalyptic number.

639086045 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

639086045 is a deficient number, since it is larger than the sum of its proper divisors (186809851).

639086045 is a wasteful number, since it uses less digits than its factorization.

639086045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832111.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 639086045 is about 25280.1512060351. The cubic root of 639086045 is about 861.3634605110.

The spelling of 639086045 in words is "six hundred thirty-nine million, eighty-six thousand, forty-five".