128904012539 has 4 divisors (see below), whose sum is σ = 129323895624. Its totient is φ = 128484129456.

The previous prime is 128904012493. The next prime is 128904012571. The reversal of 128904012539 is 935210409821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935210409821 = 113 ⋅8276198317.

It is a cyclic number.

It is not a de Polignac number, because 128904012539 - 2⁸ = 128904012283 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 128904012539.

It is not an unprimeable number, because it can be changed into a prime (128904012239) by changing a digit.

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, 209941082 + ... + 209941695.

It is an arithmetic number, because the mean of its divisors is an integer number (32330973906).

Almost surely, 2^128904012539 is an apocalyptic number.

128904012539 is a deficient number, since it is larger than the sum of its proper divisors (419883085).

128904012539 is an equidigital number, since it uses as much as digits as its factorization.

128904012539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419883084.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 128904012539 in words is "one hundred twenty-eight billion, nine hundred four million, twelve thousand, five hundred thirty-nine".