28289028 has 12 divisors (see below), whose sum is σ = 66007760. Its totient is φ = 9429672.

The previous prime is 28289021. The next prime is 28289039. The reversal of 28289028 is 82098282.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28289021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178698 + ... + 1178721.

Almost surely, 2^28289028 is an apocalyptic number.

It is an amenable number.

28289028 is an abundant number, since it is smaller than the sum of its proper divisors (37718732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28289028 is a wasteful number, since it uses less digits than its factorization.

28289028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357426 (or 2357424 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28289028 is about 5318.7430846018. The cubic root of 28289028 is about 304.7001550194.

The spelling of 28289028 in words is "twenty-eight million, two hundred eighty-nine thousand, twenty-eight".