129097280 has 56 divisors (see below), whose sum is σ = 331070712. Its totient is φ = 47665152.

The previous prime is 129097279. The next prime is 129097307. The reversal of 129097280 is 82790921.

It can be written as a sum of positive squares in 4 ways, for example, as 5798464 + 123298816 = 2408^2 + 11104^2 .

It is a super-2 number, since 2×129097280² = 33332215406796800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11357 + ... + 19676.

It is an arithmetic number, because the mean of its divisors is an integer number (5911977).

Almost surely, 2^129097280 is an apocalyptic number.

129097280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129097280 is an abundant number, since it is smaller than the sum of its proper divisors (201973432).

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

129097280 is a wasteful number, since it uses less digits than its factorization.

129097280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31063 (or 31053 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 129097280 is about 11362.0983977433. The cubic root of 129097280 is about 505.4044141481.

The spelling of 129097280 in words is "one hundred twenty-nine million, ninety-seven thousand, two hundred eighty".