128666914 has 8 divisors (see below), whose sum is σ = 204353388. Its totient is φ = 60549120.

The previous prime is 128666893. The next prime is 128666921. The reversal of 128666914 is 419666821.

It can be written as a sum of positive squares in 2 ways, for example, as 96687889 + 31979025 = 9833^2 + 5655^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892127 + ... + 1892194.

Almost surely, 2^128666914 is an apocalyptic number.

128666914 is a deficient number, since it is larger than the sum of its proper divisors (75686474).

128666914 is a wasteful number, since it uses less digits than its factorization.

128666914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784340.

The product of its digits is 124416, while the sum is 43.

The square root of 128666914 is about 11343.1439204482. The cubic root of 128666914 is about 504.8421739917.

The spelling of 128666914 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, nine hundred fourteen".