128210906 has 8 divisors (see below), whose sum is σ = 203629140. Its totient is φ = 60334528.

The previous prime is 128210903. The next prime is 128210909. The reversal of 128210906 is 609012821.

It is an interprime number because it is at equal distance from previous prime (128210903) and next prime (128210909).

It can be written as a sum of positive squares in 2 ways, for example, as 111112681 + 17098225 = 10541^2 + 4135^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128210903) 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, 1885421 + ... + 1885488.

Almost surely, 2^128210906 is an apocalyptic number.

128210906 is a deficient number, since it is larger than the sum of its proper divisors (75418234).

128210906 is a wasteful number, since it uses less digits than its factorization.

128210906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770928.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 128210906 is about 11323.0254790846. The cubic root of 128210906 is about 504.2450648508.

The spelling of 128210906 in words is "one hundred twenty-eight million, two hundred ten thousand, nine hundred six".