28308847 has 6 divisors (see below), whose sum is σ = 32369064. Its totient is φ = 24252660.

The previous prime is 28308821. The next prime is 28308851. The reversal of 28308847 is 74880382.

It is not a de Polignac number, because 28308847 - 2¹¹ = 28306799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13072 + ... + 15082.

It is an arithmetic number, because the mean of its divisors is an integer number (5394844).

Almost surely, 2^28308847 is an apocalyptic number.

28308847 is a deficient number, since it is larger than the sum of its proper divisors (4060217).

28308847 is an frugal number, since it uses more digits than its factorization.

28308847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029 (or 2018 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 28308847 is about 5320.6058865509. The cubic root of 28308847 is about 304.7712949995.

The spelling of 28308847 in words is "twenty-eight million, three hundred eight thousand, eight hundred forty-seven".