128306530 has 32 divisors (see below), whose sum is σ = 252616320. Its totient is φ = 46533120.

The previous prime is 128306513. The next prime is 128306537. The reversal of 128306530 is 35603821.

It is not an unprimeable number, because it can be changed into a prime (128306537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46962 + ... + 49618.

It is an arithmetic number, because the mean of its divisors is an integer number (7894260).

Almost surely, 2^128306530 is an apocalyptic number.

128306530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128306530 is a deficient number, since it is larger than the sum of its proper divisors (124309790).

128306530 is a wasteful number, since it uses less digits than its factorization.

128306530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 128306530 is about 11327.2472384070. The cubic root of 128306530 is about 504.3703946662.

The spelling of 128306530 in words is "one hundred twenty-eight million, three hundred six thousand, five hundred thirty".