128278307 has 2 divisors, whose sum is σ = 128278308. Its totient is φ = 128278306.

The previous prime is 128278273. The next prime is 128278313. The reversal of 128278307 is 703872821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128278307 - 2¹⁶ = 128212771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128278357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64139153 + 64139154.

It is an arithmetic number, because the mean of its divisors is an integer number (64139154).

Almost surely, 2^128278307 is an apocalyptic number.

128278307 is a deficient number, since it is larger than the sum of its proper divisors (1).

128278307 is an equidigital number, since it uses as much as digits as its factorization.

128278307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 128278307 is about 11326.0013685325. The cubic root of 128278307 is about 504.3334106054. Note that the first 3 decimals are identical.

The spelling of 128278307 in words is "one hundred twenty-eight million, two hundred seventy-eight thousand, three hundred seven".