28904566 has 8 divisors (see below), whose sum is σ = 43393680. Its totient is φ = 14440008.

The previous prime is 28904563. The next prime is 28904587. The reversal of 28904566 is 66540982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904563) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2841 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (5424210).

Almost surely, 2^28904566 is an apocalyptic number.

28904566 is a deficient number, since it is larger than the sum of its proper divisors (14489114).

28904566 is a wasteful number, since it uses less digits than its factorization.

28904566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 28904566 is about 5376.2966808018. The cubic root of 28904566 is about 306.8942967058.

The spelling of 28904566 in words is "twenty-eight million, nine hundred four thousand, five hundred sixty-six".