128809214 has 8 divisors (see below), whose sum is σ = 193724760. Its totient is φ = 64234296.

The previous prime is 128809199. The next prime is 128809217. The reversal of 128809214 is 412908821.

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

It is a super-2 number, since 2×128809214² = 33183627222595592, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128809217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84209 + ... + 85724.

It is an arithmetic number, because the mean of its divisors is an integer number (24215595).

Almost surely, 2^128809214 is an apocalyptic number.

128809214 is a deficient number, since it is larger than the sum of its proper divisors (64915546).

128809214 is a wasteful number, since it uses less digits than its factorization.

128809214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170314.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 128809214 is about 11349.4146985649. The cubic root of 128809214 is about 505.0282165719.

It can be divided in two parts, 12880921 and 4, that multiplied together give a square (51523684 = 7178²).

The spelling of 128809214 in words is "one hundred twenty-eight million, eight hundred nine thousand, two hundred fourteen".