639776466 has 48 divisors (see below), whose sum is σ = 1599621504. Its totient is φ = 181014912.

The previous prime is 639776429. The next prime is 639776483. The reversal of 639776466 is 664677936.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 11671 + ... + 37626.

It is an arithmetic number, because the mean of its divisors is an integer number (33325448).

Almost surely, 2^639776466 is an apocalyptic number.

639776466 is an abundant number, since it is smaller than the sum of its proper divisors (959845038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639776466 is a wasteful number, since it uses less digits than its factorization.

639776466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49415 (or 49412 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 54.

The square root of 639776466 is about 25293.8029169202. The cubic root of 639776466 is about 861.6735332037.

The spelling of 639776466 in words is "six hundred thirty-nine million, seven hundred seventy-six thousand, four hundred sixty-six".