128402666 has 16 divisors (see below), whose sum is σ = 233067456. Its totient is φ = 51792576.

The previous prime is 128402653. The next prime is 128402689. The reversal of 128402666 is 666204821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269516 + ... + 269991.

It is an arithmetic number, because the mean of its divisors is an integer number (14566716).

Almost surely, 2^128402666 is an apocalyptic number.

128402666 is a deficient number, since it is larger than the sum of its proper divisors (104664790).

128402666 is a wasteful number, since it uses less digits than its factorization.

128402666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539533.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 128402666 is about 11331.4900167630. The cubic root of 128402666 is about 504.4963327799.

The spelling of 128402666 in words is "one hundred twenty-eight million, four hundred two thousand, six hundred sixty-six".