128867015 has 4 divisors (see below), whose sum is σ = 154640424. Its totient is φ = 103093608.

The previous prime is 128867003. The next prime is 128867023. The reversal of 128867015 is 510768821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510768821 = 4523 ⋅112927.

It is a cyclic number.

It is not a de Polignac number, because 128867015 - 2⁶ = 128866951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128867015.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12886697 + ... + 12886706.

It is an arithmetic number, because the mean of its divisors is an integer number (38660106).

Almost surely, 2^128867015 is an apocalyptic number.

128867015 is a deficient number, since it is larger than the sum of its proper divisors (25773409).

128867015 is an equidigital number, since it uses as much as digits as its factorization.

128867015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25773408.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 128867015 is about 11351.9608438366. The cubic root of 128867015 is about 505.1037462896.

The spelling of 128867015 in words is "one hundred twenty-eight million, eight hundred sixty-seven thousand, fifteen".