28789144 has 8 divisors (see below), whose sum is σ = 53979660. Its totient is φ = 14394568.

The previous prime is 28789139. The next prime is 28789153. The reversal of 28789144 is 44198782.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28789144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1799314 + ... + 1799329.

Almost surely, 2^28789144 is an apocalyptic number.

It is an amenable number.

28789144 is a deficient number, since it is larger than the sum of its proper divisors (25190516).

28789144 is a wasteful number, since it uses less digits than its factorization.

28789144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598649 (or 3598645 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 28789144 is about 5365.5516025848. The cubic root of 28789144 is about 306.4852539727.

The spelling of 28789144 in words is "twenty-eight million, seven hundred eighty-nine thousand, one hundred forty-four".