28678149 has 6 divisors (see below), whose sum is σ = 41424006. Its totient is φ = 19118760.

The previous prime is 28678109. The next prime is 28678151. The reversal of 28678149 is 94187682.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 11189025 = 4182^2 + 3345^2 .

It is not a de Polignac number, because 28678149 - 2⁷ = 28678021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678109) 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 5 ways as a sum of consecutive naturals, for example, 1593222 + ... + 1593239.

It is an arithmetic number, because the mean of its divisors is an integer number (6904001).

Almost surely, 2^28678149 is an apocalyptic number.

It is an amenable number.

28678149 is a deficient number, since it is larger than the sum of its proper divisors (12745857).

28678149 is a wasteful number, since it uses less digits than its factorization.

28678149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186467 (or 3186464 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28678149 is about 5355.1983156555. The cubic root of 28678149 is about 306.0908675417.

The spelling of 28678149 in words is "twenty-eight million, six hundred seventy-eight thousand, one hundred forty-nine".