129642272 has 24 divisors (see below), whose sum is σ = 270248076. Its totient is φ = 61007872.

The previous prime is 129642269. The next prime is 129642277. The reversal of 129642272 is 272246921.

129642272 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 98327056 + 31315216 = 9916^2 + 5596^2 .

It is not an unprimeable number, because it can be changed into a prime (129642277) 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, 118613 + ... + 119700.

Almost surely, 2^129642272 is an apocalyptic number.

It is an amenable number.

129642272 is an abundant number, since it is smaller than the sum of its proper divisors (140605804).

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

129642272 is a wasteful number, since it uses less digits than its factorization.

129642272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238340 (or 238332 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 129642272 is about 11386.0560335877. The cubic root of 129642272 is about 506.1146141655.

The spelling of 129642272 in words is "one hundred twenty-nine million, six hundred forty-two thousand, two hundred seventy-two".