128218077 has 96 divisors (see below), whose sum is σ = 226437120. Its totient is φ = 69189120.

The previous prime is 128218009. The next prime is 128218081. The reversal of 128218077 is 770812821.

It is a happy number.

It is not a de Polignac number, because 128218077 - 2⁷ = 128217949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128218877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2419183 + ... + 2419235.

It is an arithmetic number, because the mean of its divisors is an integer number (2358720).

Almost surely, 2^128218077 is an apocalyptic number.

It is an amenable number.

128218077 is a deficient number, since it is larger than the sum of its proper divisors (98219043).

128218077 is a wasteful number, since it uses less digits than its factorization.

128218077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 128218077 is about 11323.3421303076. The cubic root of 128218077 is about 504.2544656994.

The spelling of 128218077 in words is "one hundred twenty-eight million, two hundred eighteen thousand, seventy-seven".