128812887 has 12 divisors (see below), whose sum is σ = 212643600. Its totient is φ = 73607328.

The previous prime is 128812847. The next prime is 128812889. The reversal of 128812887 is 788218821.

It is not a de Polignac number, because 128812887 - 2⁶ = 128812823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128812889) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1022262 + ... + 1022387.

It is an arithmetic number, because the mean of its divisors is an integer number (17720300).

Almost surely, 2^128812887 is an apocalyptic number.

128812887 is a deficient number, since it is larger than the sum of its proper divisors (83830713).

128812887 is a wasteful number, since it uses less digits than its factorization.

128812887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044662 (or 2044659 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 128812887 is about 11349.5765119233. The cubic root of 128812887 is about 505.0330168264.

The spelling of 128812887 in words is "one hundred twenty-eight million, eight hundred twelve thousand, eight hundred eighty-seven".