128908166 has 4 divisors (see below), whose sum is σ = 193362252. Its totient is φ = 64454082.

The previous prime is 128908163. The next prime is 128908177. The reversal of 128908166 is 661809821.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×128908166² = 33234630522967112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128908163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32227040 + ... + 32227043.

It is an arithmetic number, because the mean of its divisors is an integer number (48340563).

Almost surely, 2^128908166 is an apocalyptic number.

128908166 is a deficient number, since it is larger than the sum of its proper divisors (64454086).

128908166 is an equidigital number, since it uses as much as digits as its factorization.

128908166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64454085.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 128908166 is about 11353.7732054150. The cubic root of 128908166 is about 505.1575053584.

The spelling of 128908166 in words is "one hundred twenty-eight million, nine hundred eight thousand, one hundred sixty-six".