128275866 has 16 divisors (see below), whose sum is σ = 285057600. Its totient is φ = 42758604.

The previous prime is 128275843. The next prime is 128275871. The reversal of 128275866 is 668572821.

It is a Curzon number.

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, 1187686 + ... + 1187793.

It is an arithmetic number, because the mean of its divisors is an integer number (17816100).

Almost surely, 2^128275866 is an apocalyptic number.

128275866 is an abundant number, since it is smaller than the sum of its proper divisors (156781734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128275866 is a wasteful number, since it uses less digits than its factorization.

128275866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375490 (or 2375484 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 128275866 is about 11325.8936071288. The cubic root of 128275866 is about 504.3302116087.

The spelling of 128275866 in words is "one hundred twenty-eight million, two hundred seventy-five thousand, eight hundred sixty-six".