128278357 has 2 divisors, whose sum is σ = 128278358. Its totient is φ = 128278356.

The previous prime is 128278349. The next prime is 128278361. The reversal of 128278357 is 753872821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128278276 + 81 = 11326^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 128278357 - 2³ = 128278349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128278307) 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, 64139178 + 64139179.

It is an arithmetic number, because the mean of its divisors is an integer number (64139179).

Almost surely, 2^128278357 is an apocalyptic number.

It is an amenable number.

128278357 is a deficient number, since it is larger than the sum of its proper divisors (1).

128278357 is an equidigital number, since it uses as much as digits as its factorization.

128278357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 128278357 is about 11326.0035758426. The cubic root of 128278357 is about 504.3334761314. Note that the first 3 decimals are identical.

The spelling of 128278357 in words is "one hundred twenty-eight million, two hundred seventy-eight thousand, three hundred fifty-seven".