128987876 has 12 divisors (see below), whose sum is σ = 226336572. Its totient is φ = 64320288.

The previous prime is 128987863. The next prime is 128987897. The reversal of 128987876 is 678789821.

It can be written as a sum of positive squares in 2 ways, for example, as 40627876 + 88360000 = 6374^2 + 9400^2 .

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 3 ways as a sum of consecutive naturals, for example, 41735 + ... + 44718.

It is an arithmetic number, because the mean of its divisors is an integer number (18861381).

Almost surely, 2^128987876 is an apocalyptic number.

It is an amenable number.

128987876 is a deficient number, since it is larger than the sum of its proper divisors (97348696).

128987876 is a wasteful number, since it uses less digits than its factorization.

128987876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86830 (or 86828 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 56.

The square root of 128987876 is about 11357.2829497200. The cubic root of 128987876 is about 505.2616048099.

The spelling of 128987876 in words is "one hundred twenty-eight million, nine hundred eighty-seven thousand, eight hundred seventy-six".