128730906 has 24 divisors (see below), whose sum is σ = 285405120. Its totient is φ = 41912136.

The previous prime is 128730829. The next prime is 128730907. The reversal of 128730906 is 609037821.

It is not an unprimeable number, because it can be changed into a prime (128730907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82386 + ... + 83933.

It is an arithmetic number, because the mean of its divisors is an integer number (11891880).

Almost surely, 2^128730906 is an apocalyptic number.

128730906 is an abundant number, since it is smaller than the sum of its proper divisors (156674214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128730906 is a wasteful number, since it uses less digits than its factorization.

128730906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166370 (or 166367 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 128730906 is about 11345.9643045446. The cubic root of 128730906 is about 504.9258538986.

The spelling of 128730906 in words is "one hundred twenty-eight million, seven hundred thirty thousand, nine hundred six".