129268505 has 16 divisors (see below), whose sum is σ = 157647504. Its totient is φ = 101744640.

The previous prime is 129268501. The next prime is 129268507. The reversal of 129268505 is 505862921.

It can be written as a sum of positive squares in 8 ways, for example, as 8202496 + 121066009 = 2864^2 + 11003^2 .

It is not a de Polignac number, because 129268505 - 2² = 129268501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129268501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92915 + ... + 94295.

It is an arithmetic number, because the mean of its divisors is an integer number (9852969).

Almost surely, 2^129268505 is an apocalyptic number.

It is an amenable number.

129268505 is a deficient number, since it is larger than the sum of its proper divisors (28378999).

129268505 is a wasteful number, since it uses less digits than its factorization.

129268505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 129268505 is about 11369.6308207435. The cubic root of 129268505 is about 505.6277590032.

The spelling of 129268505 in words is "one hundred twenty-nine million, two hundred sixty-eight thousand, five hundred five".