128677711 has 4 divisors (see below), whose sum is σ = 128803312. Its totient is φ = 128552112.

The previous prime is 128677697. The next prime is 128677729. The reversal of 128677711 is 117776821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117776821 = 67 ⋅1757863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128677711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128677751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61251 + ... + 63316.

It is an arithmetic number, because the mean of its divisors is an integer number (32200828).

Almost surely, 2^128677711 is an apocalyptic number.

128677711 is a deficient number, since it is larger than the sum of its proper divisors (125601).

128677711 is a wasteful number, since it uses less digits than its factorization.

128677711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125600.

The product of its digits is 32928, while the sum is 40.

The square root of 128677711 is about 11343.6198367188. The cubic root of 128677711 is about 504.8562947638.

The spelling of 128677711 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, seven hundred eleven".