129065988 has 24 divisors (see below), whose sum is σ = 301617792. Its totient is φ = 42955744.

The previous prime is 129065987. The next prime is 129066019. The reversal of 129065988 is 889560921.

It is a happy number.

It is a super-2 number, since 2×129065988² = 33316058516832288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129065983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 16067.

It is an arithmetic number, because the mean of its divisors is an integer number (12567408).

Almost surely, 2^129065988 is an apocalyptic number.

It is an amenable number.

129065988 is an abundant number, since it is smaller than the sum of its proper divisors (172551804).

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

129065988 is a wasteful number, since it uses less digits than its factorization.

129065988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16571 (or 16569 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 129065988 is about 11360.7212799188. The cubic root of 129065988 is about 505.3635757124.

The spelling of 129065988 in words is "one hundred twenty-nine million, sixty-five thousand, nine hundred eighty-eight".