129280028 has 24 divisors (see below), whose sum is σ = 246363600. Its totient is φ = 59125248.

The previous prime is 129279979. The next prime is 129280037. The reversal of 129280028 is 820082921.

It is a junction number, because it is equal to n+sod(n) for n = 129279976 and 129280003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27125 + ... + 31532.

It is an arithmetic number, because the mean of its divisors is an integer number (10265150).

Almost surely, 2^129280028 is an apocalyptic number.

It is an amenable number.

129280028 is a deficient number, since it is larger than the sum of its proper divisors (117083572).

129280028 is a wasteful number, since it uses less digits than its factorization.

129280028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58709 (or 58707 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 129280028 is about 11370.1375541372. The cubic root of 129280028 is about 505.6427824500.

The spelling of 129280028 in words is "one hundred twenty-nine million, two hundred eighty thousand, twenty-eight".