129928658 has 8 divisors (see below), whose sum is σ = 198088140. Its totient is φ = 63899280.

The previous prime is 129928649. The next prime is 129928661. The reversal of 129928658 is 856829921.

It can be written as a sum of positive squares in 2 ways, for example, as 88416409 + 41512249 = 9403^2 + 6443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 532373 + ... + 532616.

Almost surely, 2^129928658 is an apocalyptic number.

129928658 is a deficient number, since it is larger than the sum of its proper divisors (68159482).

129928658 is a wasteful number, since it uses less digits than its factorization.

129928658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065052.

The product of its digits is 622080, while the sum is 50.

The square root of 129928658 is about 11398.6252679874. The cubic root of 129928658 is about 506.4870172378.

The spelling of 129928658 in words is "one hundred twenty-nine million, nine hundred twenty-eight thousand, six hundred fifty-eight".