128908258 has 8 divisors (see below), whose sum is σ = 193442652. Its totient is φ = 64427376.

The previous prime is 128908237. The next prime is 128908279. The reversal of 128908258 is 852809821.

It is an interprime number because it is at equal distance from previous prime (128908237) and next prime (128908279).

It can be written as a sum of positive squares in 2 ways, for example, as 128527569 + 380689 = 11337^2 + 617^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 6685 + ... + 17392.

Almost surely, 2^128908258 is an apocalyptic number.

128908258 is a deficient number, since it is larger than the sum of its proper divisors (64534394).

128908258 is a wasteful number, since it uses less digits than its factorization.

128908258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26756.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 128908258 is about 11353.7772569308. Note that the first 3 decimals coincide. The cubic root of 128908258 is about 505.1576255330.

The spelling of 128908258 in words is "one hundred twenty-eight million, nine hundred eight thousand, two hundred fifty-eight".