129028889 has 4 divisors (see below), whose sum is σ = 140758800. Its totient is φ = 117298980.

The previous prime is 129028877. The next prime is 129028909. The reversal of 129028889 is 988820921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129028889 - 2⁸ = 129028633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129022889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5864939 + ... + 5864960.

It is an arithmetic number, because the mean of its divisors is an integer number (35189700).

Almost surely, 2^129028889 is an apocalyptic number.

It is an amenable number.

129028889 is a deficient number, since it is larger than the sum of its proper divisors (11729911).

129028889 is a wasteful number, since it uses less digits than its factorization.

129028889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11729910.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 129028889 is about 11359.0883877184. The cubic root of 129028889 is about 505.3151501480.

The spelling of 129028889 in words is "one hundred twenty-nine million, twenty-eight thousand, eight hundred eighty-nine".