128863881 has 12 divisors (see below), whose sum is σ = 186250480. Its totient is φ = 85856760.

The previous prime is 128863879. The next prime is 128863897. The reversal of 128863881 is 188368821.

128863881 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 638 + 8 + 1 = 666.

It is not a de Polignac number, because 128863881 - 2¹ = 128863879 is a prime.

It is a super-2 number, since 2×128863881² = 33211799652764322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128863811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16326 + ... + 22896.

Almost surely, 2^128863881 is an apocalyptic number.

It is an amenable number.

128863881 is a deficient number, since it is larger than the sum of its proper divisors (57386599).

128863881 is a wasteful number, since it uses less digits than its factorization.

128863881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8756 (or 8753 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 128863881 is about 11351.8228051710. The cubic root of 128863881 is about 505.0996516085.

The spelling of 128863881 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, eight hundred eighty-one".