129643760 has 20 divisors (see below), whose sum is σ = 301421928. Its totient is φ = 51857472.

The previous prime is 129643741. The next prime is 129643769. The reversal of 129643760 is 67346921.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129643769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810194 + ... + 810353.

Almost surely, 2^129643760 is an apocalyptic number.

129643760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129643760 is an abundant number, since it is smaller than the sum of its proper divisors (171778168).

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

129643760 is a wasteful number, since it uses less digits than its factorization.

129643760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620560 (or 1620554 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 129643760 is about 11386.1213764829. The cubic root of 129643760 is about 506.1165505084.

The spelling of 129643760 in words is "one hundred twenty-nine million, six hundred forty-three thousand, seven hundred sixty".