128929900 has 36 divisors (see below), whose sum is σ = 305214840. Its totient is φ = 46883200.

The previous prime is 128929897. The next prime is 128929907. The reversal of 128929900 is 9929821.

It is a super-2 number, since 2×128929900² = 33245838228020000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128929907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57505 + ... + 59704.

It is an arithmetic number, because the mean of its divisors is an integer number (8478190).

Almost surely, 2^128929900 is an apocalyptic number.

128929900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128929900 is an abundant number, since it is smaller than the sum of its proper divisors (176284940).

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

128929900 is a wasteful number, since it uses less digits than its factorization.

128929900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117234 (or 117227 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 128929900 is about 11354.7302918211. The cubic root of 128929900 is about 505.1858937235.

The spelling of 128929900 in words is "one hundred twenty-eight million, nine hundred twenty-nine thousand, nine hundred".