639760122 has 48 divisors (see below), whose sum is σ = 1408350528. Its totient is φ = 209865600.

The previous prime is 639760109. The next prime is 639760129. The reversal of 639760122 is 221067936.

639760122 is a `hidden beast` number, since 639 + 7 + 6 + 0 + 12 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (639760129) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 306093 + ... + 308175.

It is an arithmetic number, because the mean of its divisors is an integer number (29340636).

Almost surely, 2^639760122 is an apocalyptic number.

639760122 is an abundant number, since it is smaller than the sum of its proper divisors (768590406).

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

639760122 is a wasteful number, since it uses less digits than its factorization.

639760122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 639760122 is about 25293.4798317669. The cubic root of 639760122 is about 861.6661955825. Note that the first 3 decimals are identical.

It can be divided in two parts, 639 and 760122, that added together give a triangular number (760761 = T₁₂₃₃).

The spelling of 639760122 in words is "six hundred thirty-nine million, seven hundred sixty thousand, one hundred twenty-two".