128908115 has 8 divisors (see below), whose sum is σ = 176788320. Its totient is φ = 88394112.

The previous prime is 128908099. The next prime is 128908121. The reversal of 128908115 is 511809821.

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

It is a cyclic number.

It is not a de Polignac number, because 128908115 - 2⁴ = 128908099 is a prime.

It is a super-2 number, since 2×128908115² = 33234604225706450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 3683089 = 128908115 / (1 + 2 + 8 + 9 + 0 + 8 + 1 + 1 + 5).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1841510 + ... + 1841579.

It is an arithmetic number, because the mean of its divisors is an integer number (22098540).

Almost surely, 2^128908115 is an apocalyptic number.

128908115 is a deficient number, since it is larger than the sum of its proper divisors (47880205).

128908115 is an equidigital number, since it uses as much as digits as its factorization.

128908115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683101.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 128908115 is about 11353.7709594654. The cubic root of 128908115 is about 505.1574387398.

The spelling of 128908115 in words is "one hundred twenty-eight million, nine hundred eight thousand, one hundred fifteen".