128066399 has 8 divisors (see below), whose sum is σ = 131738880. Its totient is φ = 124433496.

The previous prime is 128066387. The next prime is 128066401. The reversal of 128066399 is 993660821.

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

It is a cyclic number.

It is not a de Polignac number, because 128066399 - 2⁴ = 128066383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128066359) 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, 3269 + ... + 16334.

It is an arithmetic number, because the mean of its divisors is an integer number (16467360).

Almost surely, 2^128066399 is an apocalyptic number.

128066399 is a deficient number, since it is larger than the sum of its proper divisors (3672481).

128066399 is a wasteful number, since it uses less digits than its factorization.

128066399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19789.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 128066399 is about 11316.6425674756. The cubic root of 128066399 is about 504.0555481209.

The spelling of 128066399 in words is "one hundred twenty-eight million, sixty-six thousand, three hundred ninety-nine".