129704560 has 80 divisors (see below), whose sum is σ = 321381216. Its totient is φ = 48513024.

The previous prime is 129704557. The next prime is 129704579. The reversal of 129704560 is 65407921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384712 + ... + 385048.

Almost surely, 2^129704560 is an apocalyptic number.

129704560 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 129704560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160690608).

129704560 is an abundant number, since it is smaller than the sum of its proper divisors (191676656).

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

129704560 is a wasteful number, since it uses less digits than its factorization.

129704560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 129704560 is about 11388.7909806090. The cubic root of 129704560 is about 506.1956572263.

The spelling of 129704560 in words is "one hundred twenty-nine million, seven hundred four thousand, five hundred sixty".