28566149 has 4 divisors (see below), whose sum is σ = 28578060. Its totient is φ = 28554240.

The previous prime is 28566143. The next prime is 28566157. The reversal of 28566149 is 94166582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3265249 + 25300900 = 1807^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 28566149 - 2⁸ = 28565893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28566143) 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, 962 + ... + 7619.

It is an arithmetic number, because the mean of its divisors is an integer number (7144515).

Almost surely, 2^28566149 is an apocalyptic number.

It is an amenable number.

28566149 is a deficient number, since it is larger than the sum of its proper divisors (11911).

28566149 is an equidigital number, since it uses as much as digits as its factorization.

28566149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11910.

The product of its digits is 103680, while the sum is 41.

The square root of 28566149 is about 5344.7309567461. The cubic root of 28566149 is about 305.6918773218.

The spelling of 28566149 in words is "twenty-eight million, five hundred sixty-six thousand, one hundred forty-nine".