129708864 has 140 divisors (see below), whose sum is σ = 389461248. Its totient is φ = 42681600.

The previous prime is 129708863. The next prime is 129708881. The reversal of 129708864 is 468807921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129708863) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 679009 + ... + 679199.

Almost surely, 2^129708864 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 129708864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194730624).

129708864 is an abundant number, since it is smaller than the sum of its proper divisors (259752384).

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

129708864 is a wasteful number, since it uses less digits than its factorization.

129708864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 129708864 is about 11388.9799367634. The cubic root of 129708864 is about 506.2012562123.

The spelling of 129708864 in words is "one hundred twenty-nine million, seven hundred eight thousand, eight hundred sixty-four".