128368507 has 2 divisors, whose sum is σ = 128368508. Its totient is φ = 128368506.

The previous prime is 128368477. The next prime is 128368511. The reversal of 128368507 is 705863821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128368507 - 2⁷ = 128368379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128368507.

It is not a weakly prime, because it can be changed into another prime (128368567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64184253 + 64184254.

It is an arithmetic number, because the mean of its divisors is an integer number (64184254).

Almost surely, 2^128368507 is an apocalyptic number.

128368507 is a deficient number, since it is larger than the sum of its proper divisors (1).

128368507 is an equidigital number, since it uses as much as digits as its factorization.

128368507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 128368507 is about 11329.9826566505. The cubic root of 128368507 is about 504.4515917082.

The spelling of 128368507 in words is "one hundred twenty-eight million, three hundred sixty-eight thousand, five hundred seven".