128610866 has 8 divisors (see below), whose sum is σ = 193330800. Its totient is φ = 64167268.

The previous prime is 128610863. The next prime is 128610877. The reversal of 128610866 is 668016821.

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

It is not an unprimeable number, because it can be changed into a prime (128610863) 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, 67916 + ... + 69783.

It is an arithmetic number, because the mean of its divisors is an integer number (24166350).

Almost surely, 2^128610866 is an apocalyptic number.

128610866 is a deficient number, since it is larger than the sum of its proper divisors (64719934).

128610866 is a wasteful number, since it uses less digits than its factorization.

128610866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138168.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 128610866 is about 11340.6730840810. The cubic root of 128610866 is about 504.7688593562.

The spelling of 128610866 in words is "one hundred twenty-eight million, six hundred ten thousand, eight hundred sixty-six".