128268681 has 8 divisors (see below), whose sum is σ = 172685760. Its totient is φ = 84682032.

The previous prime is 128268667. The next prime is 128268691. The reversal of 128268681 is 186862821.

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

It is not a de Polignac number, because 128268681 - 2⁵ = 128268649 is a prime.

It is a super-2 number, since 2×128268681² = 32905709050959522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128268641) 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, 207246 + ... + 207863.

It is an arithmetic number, because the mean of its divisors is an integer number (21585720).

Almost surely, 2^128268681 is an apocalyptic number.

It is an amenable number.

128268681 is a deficient number, since it is larger than the sum of its proper divisors (44417079).

128268681 is a wasteful number, since it uses less digits than its factorization.

128268681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415215.

The product of its digits is 73728, while the sum is 42.

The square root of 128268681 is about 11325.5764091723. The cubic root of 128268681 is about 504.3207952356.

The spelling of 128268681 in words is "one hundred twenty-eight million, two hundred sixty-eight thousand, six hundred eighty-one".