128307679 has 2 divisors, whose sum is σ = 128307680. Its totient is φ = 128307678.

The previous prime is 128307671. The next prime is 128307689. The reversal of 128307679 is 976703821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (976703821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128307679 - 2³ = 128307671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128307671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64153839 + 64153840.

It is an arithmetic number, because the mean of its divisors is an integer number (64153840).

Almost surely, 2^128307679 is an apocalyptic number.

128307679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128307679 is an equidigital number, since it uses as much as digits as its factorization.

128307679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 128307679 is about 11327.2979567062. The cubic root of 128307679 is about 504.3719002270.

The spelling of 128307679 in words is "one hundred twenty-eight million, three hundred seven thousand, six hundred seventy-nine".