129638347944 has 64 divisors (see below), whose sum is σ = 372667722240. Its totient is φ = 36812283840.

The previous prime is 129638347933. The next prime is 129638347963. The reversal of 129638347944 is 449743836921.

It is a super-2 number, since 2×129638347944² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2339662 + ... + 2394429.

It is an arithmetic number, because the mean of its divisors is an integer number (5822933160).

Almost surely, 2^129638347944 is an apocalyptic number.

129638347944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129638347944 is an abundant number, since it is smaller than the sum of its proper divisors (243029374296).

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

129638347944 is a wasteful number, since it uses less digits than its factorization.

129638347944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734270 (or 4734266 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 60.

The spelling of 129638347944 in words is "one hundred twenty-nine billion, six hundred thirty-eight million, three hundred forty-seven thousand, nine hundred forty-four".