28328566 has 12 divisors (see below), whose sum is σ = 49430628. Its totient is φ = 12140772.

The previous prime is 28328551. The next prime is 28328591. The reversal of 28328566 is 66582382.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 144436 + ... + 144631.

It is an arithmetic number, because the mean of its divisors is an integer number (4119219).

Almost surely, 2^28328566 is an apocalyptic number.

28328566 is a deficient number, since it is larger than the sum of its proper divisors (21102062).

28328566 is a wasteful number, since it uses less digits than its factorization.

28328566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289083 (or 289076 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 28328566 is about 5322.4586423945. The cubic root of 28328566 is about 304.8420430864.

The spelling of 28328566 in words is "twenty-eight million, three hundred twenty-eight thousand, five hundred sixty-six".