128320549 has 8 divisors (see below), whose sum is σ = 146720768. Its totient is φ = 109937520.

The previous prime is 128320541. The next prime is 128320553. The reversal of 128320549 is 945023821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128320549 - 2³ = 128320541 is a prime.

It is a super-2 number, since 2×128320549² = 32932326591322802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128320541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25459 + ... + 30079.

It is an arithmetic number, because the mean of its divisors is an integer number (18340096).

Almost surely, 2^128320549 is an apocalyptic number.

It is an amenable number.

128320549 is a deficient number, since it is larger than the sum of its proper divisors (18400219).

128320549 is an equidigital number, since it uses as much as digits as its factorization.

128320549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 128320549 is about 11327.8660391090. The cubic root of 128320549 is about 504.3887634664.

The spelling of 128320549 in words is "one hundred twenty-eight million, three hundred twenty thousand, five hundred forty-nine".