129557272 has 64 divisors (see below), whose sum is σ = 279659520. Its totient is φ = 55738368.

The previous prime is 129557269. The next prime is 129557303. The reversal of 129557272 is 272755921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224248 + ... + 224824.

It is an arithmetic number, because the mean of its divisors is an integer number (4369680).

Almost surely, 2^129557272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129557272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139829760).

129557272 is an abundant number, since it is smaller than the sum of its proper divisors (150102248).

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

129557272 is a wasteful number, since it uses less digits than its factorization.

129557272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 736 counting only the distinct ones).

The product of its digits is 88200, while the sum is 40.

The square root of 129557272 is about 11382.3227857938. The cubic root of 129557272 is about 506.0039785759.

The spelling of 129557272 in words is "one hundred twenty-nine million, five hundred fifty-seven thousand, two hundred seventy-two".