128447115 has 8 divisors (see below), whose sum is σ = 205515408. Its totient is φ = 68505120.

The previous prime is 128447113. The next prime is 128447131. The reversal of 128447115 is 511744821.

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

It is not a de Polignac number, because 128447115 - 2¹ = 128447113 is a prime.

It is a super-2 number, since 2×128447115² = 32997322703646450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128447113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281556 + ... + 4281585.

It is an arithmetic number, because the mean of its divisors is an integer number (25689426).

Almost surely, 2^128447115 is an apocalyptic number.

128447115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128447115 is a deficient number, since it is larger than the sum of its proper divisors (77068293).

128447115 is an equidigital number, since it uses as much as digits as its factorization.

128447115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563149.

The product of its digits is 8960, while the sum is 33.

The square root of 128447115 is about 11333.4511513484. The cubic root of 128447115 is about 504.5545396981.

The spelling of 128447115 in words is "one hundred twenty-eight million, four hundred forty-seven thousand, one hundred fifteen".