128666894 has 8 divisors (see below), whose sum is σ = 193344840. Its totient is φ = 64218616.

The previous prime is 128666893. The next prime is 128666921. The reversal of 128666894 is 498666821.

It is a happy number.

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

It is a super-2 number, since 2×128666894² = 33110339223214472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128666893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56009 + ... + 58260.

It is an arithmetic number, because the mean of its divisors is an integer number (24168105).

Almost surely, 2^128666894 is an apocalyptic number.

128666894 is a deficient number, since it is larger than the sum of its proper divisors (64677946).

128666894 is a wasteful number, since it uses less digits than its factorization.

128666894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114834.

The product of its digits is 995328, while the sum is 50.

The square root of 128666894 is about 11343.1430388583. The cubic root of 128666894 is about 504.8421478342.

The spelling of 128666894 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, eight hundred ninety-four".