128772719 has 2 divisors, whose sum is σ = 128772720. Its totient is φ = 128772718.

The previous prime is 128772689. The next prime is 128772781. The reversal of 128772719 is 917277821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (917277821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128772719 - 2⁸ = 128772463 is a prime.

It is a super-2 number, since 2×128772719² = 33164826317305922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128772719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128772619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64386359 + 64386360.

It is an arithmetic number, because the mean of its divisors is an integer number (64386360).

Almost surely, 2^128772719 is an apocalyptic number.

128772719 is a deficient number, since it is larger than the sum of its proper divisors (1).

128772719 is an equidigital number, since it uses as much as digits as its factorization.

128772719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 44.

The square root of 128772719 is about 11347.8067925040. The cubic root of 128772719 is about 504.9805161911.

The spelling of 128772719 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, seven hundred nineteen".