128679644 has 12 divisors (see below), whose sum is σ = 225771000. Its totient is φ = 64173648.

The previous prime is 128679611. The next prime is 128679653. The reversal of 128679644 is 446976821.

It is a congruent number.

It is an unprimeable number.

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, 39794 + ... + 42905.

It is an arithmetic number, because the mean of its divisors is an integer number (18814250).

Almost surely, 2^128679644 is an apocalyptic number.

It is an amenable number.

128679644 is a deficient number, since it is larger than the sum of its proper divisors (97091356).

128679644 is a wasteful number, since it uses less digits than its factorization.

128679644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83092 (or 83090 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 128679644 is about 11343.7050384784. The cubic root of 128679644 is about 504.8588227394.

The spelling of 128679644 in words is "one hundred twenty-eight million, six hundred seventy-nine thousand, six hundred forty-four".