127728481 has 2 divisors, whose sum is σ = 127728482. Its totient is φ = 127728480.

The previous prime is 127728479. The next prime is 127728511. The reversal of 127728481 is 184827721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78854400 + 48874081 = 8880^2 + 6991^2 .

It is a cyclic number.

It is not a de Polignac number, because 127728481 - 2¹ = 127728479 is a prime.

It is a super-2 number, since 2×127728481² = 32629129717134722, which contains 22 as substring.

Together with 127728479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (127728421) 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 as a sum of consecutive naturals, namely, 63864240 + 63864241.

It is an arithmetic number, because the mean of its divisors is an integer number (63864241).

Almost surely, 2^127728481 is an apocalyptic number.

It is an amenable number.

127728481 is a deficient number, since it is larger than the sum of its proper divisors (1).

127728481 is an equidigital number, since it uses as much as digits as its factorization.

127728481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 40.

The square root of 127728481 is about 11301.7025708519. The cubic root of 127728481 is about 503.6118213371.

The spelling of 127728481 in words is "one hundred twenty-seven million, seven hundred twenty-eight thousand, four hundred eighty-one".