129009660 has 48 divisors (see below), whose sum is σ = 389016096. Its totient is φ = 31756032.

The previous prime is 129009649. The next prime is 129009667. The reversal of 129009660 is 66900921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129009667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81919 + ... + 83478.

It is an arithmetic number, because the mean of its divisors is an integer number (8104502).

Almost surely, 2^129009660 is an apocalyptic number.

129009660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129009660 is an abundant number, since it is smaller than the sum of its proper divisors (260006436).

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

129009660 is a wasteful number, since it uses less digits than its factorization.

129009660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165422 (or 165420 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 129009660 is about 11358.2419414274. The cubic root of 129009660 is about 505.2900467575.

The spelling of 129009660 in words is "one hundred twenty-nine million, nine thousand, six hundred sixty".