128927868 has 24 divisors (see below), whose sum is σ = 301421568. Its totient is φ = 42891696.

The previous prime is 128927837. The next prime is 128927873. The reversal of 128927868 is 868729821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128927868.

It is a congruent 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, 3996 + ... + 16547.

It is an arithmetic number, because the mean of its divisors is an integer number (12559232).

Almost surely, 2^128927868 is an apocalyptic number.

It is an amenable number.

128927868 is an abundant number, since it is smaller than the sum of its proper divisors (172493700).

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

128927868 is a wasteful number, since it uses less digits than its factorization.

128927868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21073 (or 21071 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 128927868 is about 11354.6408133415. The cubic root of 128927868 is about 505.1832397151.

It can be divided in two parts, 128927 and 868, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 128927868 in words is "one hundred twenty-eight million, nine hundred twenty-seven thousand, eight hundred sixty-eight".