128667913 has 8 divisors (see below), whose sum is σ = 140986080. Its totient is φ = 116455540.

The previous prime is 128667901. The next prime is 128667919. The reversal of 128667913 is 319766821.

It is not a de Polignac number, because 128667913 - 2¹³ = 128659721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128667913.

It is not an unprimeable number, because it can be changed into a prime (128667919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 566706 + ... + 566932.

It is an arithmetic number, because the mean of its divisors is an integer number (17623260).

Almost surely, 2^128667913 is an apocalyptic number.

It is an amenable number.

128667913 is a deficient number, since it is larger than the sum of its proper divisors (12318167).

128667913 is an frugal number, since it uses more digits than its factorization.

128667913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 238 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 128667913 is about 11343.1879557733. The cubic root of 128667913 is about 504.8434805592.

The spelling of 128667913 in words is "one hundred twenty-eight million, six hundred sixty-seven thousand, nine hundred thirteen".