129868905420 has 72 divisors (see below), whose sum is σ = 408525905424. Its totient is φ = 34631706816.

The previous prime is 129868905391. The next prime is 129868905421. The reversal of 129868905420 is 24509868921.

It is a happy number.

129868905420 is a `hidden beast` number, since 1 + 2 + 9 + 8 + 6 + 8 + 90 + 542 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (129868905421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13356139 + ... + 13365858.

Almost surely, 2^129868905420 is an apocalyptic number.

129868905420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129868905420 is an abundant number, since it is smaller than the sum of its proper divisors (278657000004).

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

129868905420 is a wasteful number, since it uses less digits than its factorization.

129868905420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26722021 (or 26722007 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 129868905420 in words is "one hundred twenty-nine billion, eight hundred sixty-eight million, nine hundred five thousand, four hundred twenty".