129102080 has 108 divisors (see below), whose sum is σ = 329441700. Its totient is φ = 48463872.

The previous prime is 129102079. The next prime is 129102109. The reversal of 129102080 is 80201921.

It can be written as a sum of positive squares in 6 ways, for example, as 14868736 + 114233344 = 3856^2 + 10688^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369746 + ... + 370094.

Almost surely, 2^129102080 is an apocalyptic number.

129102080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129102080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164720850).

129102080 is an abundant number, since it is smaller than the sum of its proper divisors (200339620).

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

129102080 is an equidigital number, since it uses as much as digits as its factorization.

129102080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 129102080 is about 11362.3096243677. The cubic root of 129102080 is about 505.4106779288.

The spelling of 129102080 in words is "one hundred twenty-nine million, one hundred two thousand, eighty".