129728208 has 20 divisors (see below), whose sum is σ = 335131328. Its totient is φ = 43242720.

The previous prime is 129728201. The next prime is 129728279. The reversal of 129728208 is 802827921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129728201) 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, 1351288 + ... + 1351383.

Almost surely, 2^129728208 is an apocalyptic number.

It is an amenable number.

129728208 is an abundant number, since it is smaller than the sum of its proper divisors (205403120).

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

129728208 is a wasteful number, since it uses less digits than its factorization.

129728208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702682 (or 2702676 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 129728208 is about 11389.8291470943. The cubic root of 129728208 is about 506.2264188986.

The spelling of 129728208 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, two hundred eight".