28385384 has 8 divisors (see below), whose sum is σ = 53222610. Its totient is φ = 14192688.

The previous prime is 28385377. The next prime is 28385387. The reversal of 28385384 is 48358382.

It can be written as a sum of positive squares in only one way, i.e., 21362884 + 7022500 = 4622^2 + 2650^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28385387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1774079 + ... + 1774094.

Almost surely, 2^28385384 is an apocalyptic number.

It is an amenable number.

28385384 is a deficient number, since it is larger than the sum of its proper divisors (24837226).

28385384 is a wasteful number, since it uses less digits than its factorization.

28385384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548179 (or 3548175 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 28385384 is about 5327.7935395434. The cubic root of 28385384 is about 305.0457120413.

The spelling of 28385384 in words is "twenty-eight million, three hundred eighty-five thousand, three hundred eighty-four".