129789660 has 192 divisors, whose sum is σ = 488162304. Its totient is φ = 24883200.

The previous prime is 129789659. The next prime is 129789677. The reversal of 129789660 is 66987921.

129789660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58980 + ... + 61140.

It is an arithmetic number, because the mean of its divisors is an integer number (2542512).

Almost surely, 2^129789660 is an apocalyptic number.

129789660 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 129789660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244081152).

129789660 is an abundant number, since it is smaller than the sum of its proper divisors (358372644).

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

129789660 is a wasteful number, since it uses less digits than its factorization.

129789660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2202 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 129789660 is about 11392.5264976650. The cubic root of 129789660 is about 506.3063391041.

The spelling of 129789660 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, six hundred sixty".