128668868 has 6 divisors (see below), whose sum is σ = 225170526. Its totient is φ = 64334432.

The previous prime is 128668867. The next prime is 128668871. The reversal of 128668868 is 868866821.

It can be written as a sum of positive squares in only one way, i.e., 127418944 + 1249924 = 11288^2 + 1118^2 .

It is a super-4 number, since 4×128668868⁴ (a number of 34 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (128668867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16083605 + ... + 16083612.

It is an arithmetic number, because the mean of its divisors is an integer number (37528421).

Almost surely, 2^128668868 is an apocalyptic number.

It is an amenable number.

128668868 is a deficient number, since it is larger than the sum of its proper divisors (96501658).

128668868 is a wasteful number, since it uses less digits than its factorization.

128668868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32167221 (or 32167219 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 53.

The square root of 128668868 is about 11343.2300514448. The cubic root of 128668868 is about 504.8447295739.

The spelling of 128668868 in words is "one hundred twenty-eight million, six hundred sixty-eight thousand, eight hundred sixty-eight".