128506906 has 8 divisors (see below), whose sum is σ = 210284064. Its totient is φ = 58412220.

The previous prime is 128506891. The next prime is 128506907. The reversal of 128506906 is 609605821.

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 (128506907) 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, 2920590 + ... + 2920633.

It is an arithmetic number, because the mean of its divisors is an integer number (26285508).

Almost surely, 2^128506906 is an apocalyptic number.

128506906 is a deficient number, since it is larger than the sum of its proper divisors (81777158).

128506906 is a wasteful number, since it uses less digits than its factorization.

128506906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841236.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 128506906 is about 11336.0886552638. The cubic root of 128506906 is about 504.6328161176.

The spelling of 128506906 in words is "one hundred twenty-eight million, five hundred six thousand, nine hundred six".