128918881 has 8 divisors (see below), whose sum is σ = 158669504. Its totient is φ = 102001680.

The previous prime is 128918861. The next prime is 128918893. The reversal of 128918881 is 188819821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128918881 - 2⁵ = 128918849 is a prime.

It is a super-2 number, since 2×128918881² = 33240155756584322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128918821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708255 + ... + 708436.

It is an arithmetic number, because the mean of its divisors is an integer number (19833688).

Almost surely, 2^128918881 is an apocalyptic number.

It is an amenable number.

128918881 is a deficient number, since it is larger than the sum of its proper divisors (29750623).

128918881 is a wasteful number, since it uses less digits than its factorization.

128918881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416711.

The product of its digits is 73728, while the sum is 46.

The square root of 128918881 is about 11354.2450651728. The cubic root of 128918881 is about 505.1715014014.

The spelling of 128918881 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, eight hundred eighty-one".