129478028 has 12 divisors (see below), whose sum is σ = 226695672. Its totient is φ = 64707840.

The previous prime is 129478009. The next prime is 129478049. The reversal of 129478028 is 820874921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3308 + ... + 16428.

It is an arithmetic number, because the mean of its divisors is an integer number (18891306).

Almost surely, 2^129478028 is an apocalyptic number.

It is an amenable number.

129478028 is a deficient number, since it is larger than the sum of its proper divisors (97217644).

129478028 is a wasteful number, since it uses less digits than its factorization.

129478028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15592 (or 15590 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 129478028 is about 11378.8412415325. The cubic root of 129478028 is about 505.9007913735.

The spelling of 129478028 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, twenty-eight".