128772079 has 2 divisors, whose sum is σ = 128772080. Its totient is φ = 128772078.

The previous prime is 128772067. The next prime is 128772121. The reversal of 128772079 is 970277821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128772079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128772029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64386039 + 64386040.

It is an arithmetic number, because the mean of its divisors is an integer number (64386040).

Almost surely, 2^128772079 is an apocalyptic number.

128772079 is a deficient number, since it is larger than the sum of its proper divisors (1).

128772079 is an equidigital number, since it uses as much as digits as its factorization.

128772079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 128772079 is about 11347.7785931873. The cubic root of 128772079 is about 504.9796796058.

The spelling of 128772079 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, seventy-nine".