128686744 has 8 divisors (see below), whose sum is σ = 241287660. Its totient is φ = 64343368.

The previous prime is 128686711. The next prime is 128686751. The reversal of 128686744 is 447686821.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 128686694 and 128686703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8042914 + ... + 8042929.

Almost surely, 2^128686744 is an apocalyptic number.

It is an amenable number.

128686744 is a deficient number, since it is larger than the sum of its proper divisors (112600916).

128686744 is a wasteful number, since it uses less digits than its factorization.

128686744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16085849 (or 16085845 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 128686744 is about 11344.0179830605. The cubic root of 128686744 is about 504.8681078954.

The spelling of 128686744 in words is "one hundred twenty-eight million, six hundred eighty-six thousand, seven hundred forty-four".