28808649 has 8 divisors (see below), whose sum is σ = 42679520. Its totient is φ = 19205748.

The previous prime is 28808623. The next prime is 28808651. The reversal of 28808649 is 94680882.

It is a happy number.

It is not a de Polignac number, because 28808649 - 2⁹ = 28808137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28808699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533467 + ... + 533520.

It is an arithmetic number, because the mean of its divisors is an integer number (5334940).

Almost surely, 2^28808649 is an apocalyptic number.

It is an amenable number.

28808649 is a deficient number, since it is larger than the sum of its proper divisors (13870871).

28808649 is a wasteful number, since it uses less digits than its factorization.

28808649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066996 (or 1066990 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 28808649 is about 5367.3689085063. The cubic root of 28808649 is about 306.5544541932.

The spelling of 28808649 in words is "twenty-eight million, eight hundred eight thousand, six hundred forty-nine".