128677765 has 8 divisors (see below), whose sum is σ = 154539648. Its totient is φ = 102858000.

The previous prime is 128677751. The next prime is 128677771. The reversal of 128677765 is 567776821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128677765 - 2¹³ = 128669573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3361 + ... + 16390.

It is an arithmetic number, because the mean of its divisors is an integer number (19317456).

Almost surely, 2^128677765 is an apocalyptic number.

It is an amenable number.

128677765 is a deficient number, since it is larger than the sum of its proper divisors (25861883).

128677765 is a wasteful number, since it uses less digits than its factorization.

128677765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21059.

The product of its digits is 987840, while the sum is 49.

The square root of 128677765 is about 11343.6222169111. The cubic root of 128677765 is about 504.8563653853.

The spelling of 128677765 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, seven hundred sixty-five".