128015879 has 2 divisors, whose sum is σ = 128015880. Its totient is φ = 128015878.

The previous prime is 128015843. The next prime is 128015887. The reversal of 128015879 is 978510821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128015879 is a prime.

It is a super-3 number, since 3×128015879³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128015579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64007939 + 64007940.

It is an arithmetic number, because the mean of its divisors is an integer number (64007940).

Almost surely, 2^128015879 is an apocalyptic number.

128015879 is a deficient number, since it is larger than the sum of its proper divisors (1).

128015879 is an equidigital number, since it uses as much as digits as its factorization.

128015879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 128015879 is about 11314.4102365081. The cubic root of 128015879 is about 503.9892589779.

The spelling of 128015879 in words is "one hundred twenty-eight million, fifteen thousand, eight hundred seventy-nine".