129628 has 12 divisors (see below), whose sum is σ = 236880. Its totient is φ = 61952.

The previous prime is 129607. The next prime is 129629. The reversal of 129628 is 826921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129596 and 129605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (19740).

2¹²⁹⁶²⁸ is an apocalyptic number.

It is an amenable number.

129628 is a deficient number, since it is larger than the sum of its proper divisors (107252).

129628 is a wasteful number, since it uses less digits than its factorization.

129628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436 (or 1434 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 129628 is about 360.0388867886. The cubic root of 129628 is about 50.6096041178.

Subtracting from 129628 its sum of digits (28), we obtain a square (129600 = 360²).

It can be divided in two parts, 129 and 628, that added together give a palindrome (757).

The spelling of 129628 in words is "one hundred twenty-nine thousand, six hundred twenty-eight".