28008873 has 12 divisors (see below), whose sum is σ = 40693380. Its totient is φ = 18563616.

The previous prime is 28008853. The next prime is 28008887. The reversal of 28008873 is 37880082.

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 4272489 = 4872^2 + 2067^2 .

It is not a de Polignac number, because 28008873 - 2¹⁶ = 27943337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28008803) 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 11 ways as a sum of consecutive naturals, for example, 7438 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (3391115).

Almost surely, 2^28008873 is an apocalyptic number.

It is an amenable number.

28008873 is a deficient number, since it is larger than the sum of its proper divisors (12684507).

28008873 is a wasteful number, since it uses less digits than its factorization.

28008873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18168 (or 18165 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28008873 is about 5292.3409754097. The cubic root of 28008873 is about 303.6909695785.

The spelling of 28008873 in words is "twenty-eight million, eight thousand, eight hundred seventy-three".