128677867 has 2 divisors, whose sum is σ = 128677868. Its totient is φ = 128677866.

The previous prime is 128677859. The next prime is 128677873. The reversal of 128677867 is 768776821.

It is a strong prime.

It is an emirp because it is prime and its reverse (768776821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128677867 - 2³ = 128677859 is a prime.

It is not a weakly prime, because it can be changed into another prime (128677817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64338933 + 64338934.

It is an arithmetic number, because the mean of its divisors is an integer number (64338934).

Almost surely, 2^128677867 is an apocalyptic number.

128677867 is a deficient number, since it is larger than the sum of its proper divisors (1).

128677867 is an equidigital number, since it uses as much as digits as its factorization.

128677867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 52.

The square root of 128677867 is about 11343.6267128287. The cubic root of 128677867 is about 504.8564987814.

The spelling of 128677867 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, eight hundred sixty-seven".