129761272 has 32 divisors (see below), whose sum is σ = 263617200. Its totient is φ = 59641344.

The previous prime is 129761263. The next prime is 129761273. The reversal of 129761272 is 272167921.

It is a super-2 number, since 2×129761272² = 33675975422115968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129761273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5247 + ... + 16942.

Almost surely, 2^129761272 is an apocalyptic number.

It is an amenable number.

129761272 is an abundant number, since it is smaller than the sum of its proper divisors (133855928).

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

129761272 is a wasteful number, since it uses less digits than its factorization.

129761272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22255 (or 22251 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 129761272 is about 11391.2805250332. The cubic root of 129761272 is about 506.2694227777.

The spelling of 129761272 in words is "one hundred twenty-nine million, seven hundred sixty-one thousand, two hundred seventy-two".