128296866 has 16 divisors (see below), whose sum is σ = 259135488. Its totient is φ = 42342000.

The previous prime is 128296859. The next prime is 128296891. The reversal of 128296866 is 668692821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105250 + ... + 106461.

It is an arithmetic number, because the mean of its divisors is an integer number (16195968).

Almost surely, 2^128296866 is an apocalyptic number.

128296866 is an abundant number, since it is smaller than the sum of its proper divisors (130838622).

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

128296866 is a wasteful number, since it uses less digits than its factorization.

128296866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211817.

The product of its digits is 497664, while the sum is 48.

The square root of 128296866 is about 11326.8206483549. The cubic root of 128296866 is about 504.3577313515.

The spelling of 128296866 in words is "one hundred twenty-eight million, two hundred ninety-six thousand, eight hundred sixty-six".