129170028 has 24 divisors (see below), whose sum is σ = 324581488. Its totient is φ = 39744576.

The previous prime is 129170021. The next prime is 129170033. The reversal of 129170028 is 820071921.

It is a super-2 number, since 2×129170028² = 33369792267041568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129169977 and 129170004.

It is not an unprimeable number, because it can be changed into a prime (129170021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413851 + ... + 414162.

Almost surely, 2^129170028 is an apocalyptic number.

It is an amenable number.

129170028 is an abundant number, since it is smaller than the sum of its proper divisors (195411460).

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

129170028 is a wasteful number, since it uses less digits than its factorization.

129170028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828033 (or 828031 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 129170028 is about 11365.2992921436. The cubic root of 129170028 is about 505.4993303132.

The spelling of 129170028 in words is "one hundred twenty-nine million, one hundred seventy thousand, twenty-eight".