129428658 has 32 divisors (see below), whose sum is σ = 296901120. Its totient is φ = 41750640.

The previous prime is 129428639. The next prime is 129428687. The reversal of 129428658 is 856824921.

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 15 ways as a sum of consecutive naturals, for example, 36985 + ... + 40332.

It is an arithmetic number, because the mean of its divisors is an integer number (9278160).

Almost surely, 2^129428658 is an apocalyptic number.

129428658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129428658 is an abundant number, since it is smaller than the sum of its proper divisors (167472462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129428658 is a wasteful number, since it uses less digits than its factorization.

129428658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77359 (or 77353 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 129428658 is about 11376.6716573873. The cubic root of 129428658 is about 505.8364831722.

The spelling of 129428658 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, six hundred fifty-eight".