128312830 has 32 divisors (see below), whose sum is σ = 236019744. Its totient is φ = 50213376.

The previous prime is 128312819. The next prime is 128312831. The reversal of 128312830 is 38213821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128312831) 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 15 ways as a sum of consecutive naturals, for example, 99369 + ... + 100651.

It is an arithmetic number, because the mean of its divisors is an integer number (7375617).

Almost surely, 2^128312830 is an apocalyptic number.

128312830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128312830 is a deficient number, since it is larger than the sum of its proper divisors (107706914).

128312830 is a wasteful number, since it uses less digits than its factorization.

128312830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 128312830 is about 11327.5253255069. The cubic root of 128312830 is about 504.3786495889.

Subtracting from 128312830 its reverse (38213821), we obtain a palindrome (90099009).

The spelling of 128312830 in words is "one hundred twenty-eight million, three hundred twelve thousand, eight hundred thirty".