129769664 has 42 divisors (see below), whose sum is σ = 266808204. Its totient is φ = 62621440.

The previous prime is 129769649. The next prime is 129769669. The reversal of 129769664 is 466967921.

It is not an unprimeable number, because it can be changed into a prime (129769669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52619 + ... + 55029.

Almost surely, 2^129769664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129769664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133404102).

129769664 is an abundant number, since it is smaller than the sum of its proper divisors (137038540).

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

129769664 is an equidigital number, since it uses as much as digits as its factorization.

129769664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2442 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 129769664 is about 11391.6488709932. The cubic root of 129769664 is about 506.2803364639.

The spelling of 129769664 in words is "one hundred twenty-nine million, seven hundred sixty-nine thousand, six hundred sixty-four".