128936867 has 2 divisors, whose sum is σ = 128936868. Its totient is φ = 128936866.

The previous prime is 128936861. The next prime is 128936893. The reversal of 128936867 is 768639821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128936867 - 2⁴ = 128936851 is a prime.

It is not a weakly prime, because it can be changed into another prime (128936861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64468433 + 64468434.

It is an arithmetic number, because the mean of its divisors is an integer number (64468434).

Almost surely, 2^128936867 is an apocalyptic number.

128936867 is a deficient number, since it is larger than the sum of its proper divisors (1).

128936867 is an equidigital number, since it uses as much as digits as its factorization.

128936867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 128936867 is about 11355.0370761174. The cubic root of 128936867 is about 505.1949931559.

The spelling of 128936867 in words is "one hundred twenty-eight million, nine hundred thirty-six thousand, eight hundred sixty-seven".