128869912 has 8 divisors (see below), whose sum is σ = 241631100. Its totient is φ = 64434952.

The previous prime is 128869903. The next prime is 128869921. The reversal of 128869912 is 219968821.

It is an interprime number because it is at equal distance from previous prime (128869903) and next prime (128869921).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8054362 + ... + 8054377.

Almost surely, 2^128869912 is an apocalyptic number.

It is an amenable number.

128869912 is a deficient number, since it is larger than the sum of its proper divisors (112761188).

128869912 is a wasteful number, since it uses less digits than its factorization.

128869912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16108745 (or 16108741 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 128869912 is about 11352.0884422207. The cubic root of 128869912 is about 505.1075312628.

The spelling of 128869912 in words is "one hundred twenty-eight million, eight hundred sixty-nine thousand, nine hundred twelve".