128873261 has 16 divisors (see below), whose sum is σ = 142829568. Its totient is φ = 115306800.

The previous prime is 128873249. The next prime is 128873281. The reversal of 128873261 is 162378821.

It is a cyclic number.

It is not a de Polignac number, because 128873261 - 2⁶ = 128873197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128873281) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 262226 + ... + 262716.

It is an arithmetic number, because the mean of its divisors is an integer number (8926848).

Almost surely, 2^128873261 is an apocalyptic number.

128873261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128873261 is a deficient number, since it is larger than the sum of its proper divisors (13956307).

128873261 is a wasteful number, since it uses less digits than its factorization.

128873261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its digits is 32256, while the sum is 38.

The square root of 128873261 is about 11352.2359471604. The cubic root of 128873261 is about 505.1119067099. Note that the first 3 decimals are identical.

The spelling of 128873261 in words is "one hundred twenty-eight million, eight hundred seventy-three thousand, two hundred sixty-one".