128681966 has 8 divisors (see below), whose sum is σ = 220597680. Its totient is φ = 55149408.

The previous prime is 128681947. The next prime is 128681977. The reversal of 128681966 is 669186821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128681966.

It is a congruent number.

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, 4595771 + ... + 4595798.

It is an arithmetic number, because the mean of its divisors is an integer number (27574710).

Almost surely, 2^128681966 is an apocalyptic number.

128681966 is a deficient number, since it is larger than the sum of its proper divisors (91915714).

128681966 is an equidigital number, since it uses as much as digits as its factorization.

128681966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191578.

The product of its digits is 248832, while the sum is 47.

The square root of 128681966 is about 11343.8073855298. The cubic root of 128681966 is about 504.8618594153.

The spelling of 128681966 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, nine hundred sixty-six".