6639394630 has 48 divisors (see below), whose sum is σ = 13302596160. Its totient is φ = 2383729920.

The previous prime is 6639394621. The next prime is 6639394639. The reversal of 6639394630 is 364939366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6639394621) and next prime (6639394639).

It is a super-2 number, since 2×6639394630² = 88163122105745673800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639394639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60862 + ... + 130318.

It is an arithmetic number, because the mean of its divisors is an integer number (277137420).

Almost surely, 2^6639394630 is an apocalyptic number.

6639394630 is an abundant number, since it is smaller than the sum of its proper divisors (6663201530).

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

6639394630 is a wasteful number, since it uses less digits than its factorization.

6639394630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69565 (or 69554 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 49.

The square root of 6639394630 is about 81482.4805096163. The cubic root of 6639394630 is about 1879.5021533350.

The spelling of 6639394630 in words is "six billion, six hundred thirty-nine million, three hundred ninety-four thousand, six hundred thirty".