28149568 has 28 divisors (see below), whose sum is σ = 56029860. Its totient is φ = 14031872.

The previous prime is 28149559. The next prime is 28149593. The reversal of 28149568 is 86594182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3069504 + 25080064 = 1752^2 + 5008^2 .

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 3 ways as a sum of consecutive naturals, for example, 36030 + ... + 36802.

Almost surely, 2^28149568 is an apocalyptic number.

It is an amenable number.

28149568 is a deficient number, since it is larger than the sum of its proper divisors (27880292).

28149568 is an equidigital number, since it uses as much as digits as its factorization.

28149568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1344 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 28149568 is about 5305.6166465360. The cubic root of 28149568 is about 304.1986236601.

The spelling of 28149568 in words is "twenty-eight million, one hundred forty-nine thousand, five hundred sixty-eight".