128804461 has 4 divisors (see below), whose sum is σ = 136381212. Its totient is φ = 121227712.

The previous prime is 128804453. The next prime is 128804483. The reversal of 128804461 is 164408821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113827561 + 14976900 = 10669^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 128804461 - 2³ = 128804453 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 (128804441) 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 3 ways as a sum of consecutive naturals, for example, 3788350 + ... + 3788383.

It is an arithmetic number, because the mean of its divisors is an integer number (34095303).

Almost surely, 2^128804461 is an apocalyptic number.

It is an amenable number.

128804461 is a deficient number, since it is larger than the sum of its proper divisors (7576751).

128804461 is an equidigital number, since it uses as much as digits as its factorization.

128804461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7576750.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 128804461 is about 11349.2053025752. The cubic root of 128804461 is about 505.0220047269.

The spelling of 128804461 in words is "one hundred twenty-eight million, eight hundred four thousand, four hundred sixty-one".