128718067 has 4 divisors (see below), whose sum is σ = 136289736. Its totient is φ = 121146400.

The previous prime is 128718061. The next prime is 128718131. The reversal of 128718067 is 760817821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 760817821 = 3079 ⋅247099.

It is a cyclic number.

It is not a de Polignac number, because 128718067 - 2³ = 128718059 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128718061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3785809 + ... + 3785842.

It is an arithmetic number, because the mean of its divisors is an integer number (34072434).

Almost surely, 2^128718067 is an apocalyptic number.

128718067 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128718067 is a deficient number, since it is larger than the sum of its proper divisors (7571669).

128718067 is an equidigital number, since it uses as much as digits as its factorization.

128718067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571668.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 128718067 is about 11345.3984945439. The cubic root of 128718067 is about 504.9090670503.

The spelling of 128718067 in words is "one hundred twenty-eight million, seven hundred eighteen thousand, sixty-seven".