129275280 has 60 divisors (see below), whose sum is σ = 434151900. Its totient is φ = 34473216.

The previous prime is 129275273. The next prime is 129275317. The reversal of 129275280 is 82572921.

129275280 is a `hidden beast` number, since 129 + 2 + 7 + 528 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 73205136 + 56070144 = 8556^2 + 7488^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 89055 + ... + 90494.

It is an arithmetic number, because the mean of its divisors is an integer number (7235865).

Almost surely, 2^129275280 is an apocalyptic number.

129275280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129275280 is an abundant number, since it is smaller than the sum of its proper divisors (304876620).

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

129275280 is a wasteful number, since it uses less digits than its factorization.

129275280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179568 (or 179559 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 129275280 is about 11369.9287596713. The cubic root of 129275280 is about 505.6365922149.

The spelling of 129275280 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, two hundred eighty".