128315867 has 4 divisors (see below), whose sum is σ = 128511240. Its totient is φ = 128120496.

The previous prime is 128315861. The next prime is 128315897. The reversal of 128315867 is 768513821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768513821 = 239 ⋅3215539.

It is a cyclic number.

It is not a de Polignac number, because 128315867 - 2⁸ = 128315611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128315861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96698 + ... + 98015.

It is an arithmetic number, because the mean of its divisors is an integer number (32127810).

Almost surely, 2^128315867 is an apocalyptic number.

128315867 is a deficient number, since it is larger than the sum of its proper divisors (195373).

128315867 is an equidigital number, since it uses as much as digits as its factorization.

128315867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195372.

The product of its digits is 80640, while the sum is 41.

The square root of 128315867 is about 11327.6593787066. The cubic root of 128315867 is about 504.3826288893.

The spelling of 128315867 in words is "one hundred twenty-eight million, three hundred fifteen thousand, eight hundred sixty-seven".