128258915 has 4 divisors (see below), whose sum is σ = 153910704. Its totient is φ = 102607128.

The previous prime is 128258903. The next prime is 128258939. The reversal of 128258915 is 519852821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 519852821 = 83 ⋅6263287.

It is a cyclic number.

It is not a de Polignac number, because 128258915 - 2⁴ = 128258899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12825887 + ... + 12825896.

It is an arithmetic number, because the mean of its divisors is an integer number (38477676).

Almost surely, 2^128258915 is an apocalyptic number.

128258915 is a deficient number, since it is larger than the sum of its proper divisors (25651789).

128258915 is an equidigital number, since it uses as much as digits as its factorization.

128258915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25651788.

The product of its digits is 57600, while the sum is 41.

The square root of 128258915 is about 11325.1452529316. The cubic root of 128258915 is about 504.3079957435.

The spelling of 128258915 in words is "one hundred twenty-eight million, two hundred fifty-eight thousand, nine hundred fifteen".