28881306 has 16 divisors (see below), whose sum is σ = 64180800. Its totient is φ = 9627084.

The previous prime is 28881299. The next prime is 28881313. The reversal of 28881306 is 60318882.

It is an interprime number because it is at equal distance from previous prime (28881299) and next prime (28881313).

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 267366 + ... + 267473.

It is an arithmetic number, because the mean of its divisors is an integer number (4011300).

Almost surely, 2^28881306 is an apocalyptic number.

28881306 is an abundant number, since it is smaller than the sum of its proper divisors (35299494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28881306 is a wasteful number, since it uses less digits than its factorization.

28881306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534850 (or 534844 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28881306 is about 5374.1330463620. The cubic root of 28881306 is about 306.8119535795.

The spelling of 28881306 in words is "twenty-eight million, eight hundred eighty-one thousand, three hundred six".