129125028 has 48 divisors (see below), whose sum is σ = 307252736. Its totient is φ = 42197760.

The previous prime is 129125021. The next prime is 129125053. The reversal of 129125028 is 820521921.

It is a junction number, because it is equal to n+sod(n) for n = 129124986 and 129125004.

It is not an unprimeable number, because it can be changed into a prime (129125021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195018 + ... + 195678.

Almost surely, 2^129125028 is an apocalyptic number.

It is an amenable number.

129125028 is an abundant number, since it is smaller than the sum of its proper divisors (178127708).

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

129125028 is a wasteful number, since it uses less digits than its factorization.

129125028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 129125028 is about 11363.3194093979. The cubic root of 129125028 is about 505.4406218747.

Adding to 129125028 its reverse (820521921), we get a palindrome (949646949).

The spelling of 129125028 in words is "one hundred twenty-nine million, one hundred twenty-five thousand, twenty-eight".