28388473 has 2 divisors, whose sum is σ = 28388474. Its totient is φ = 28388472.

The previous prime is 28388449. The next prime is 28388513. The reversal of 28388473 is 37488382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15657849 + 12730624 = 3957^2 + 3568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28388473 is a prime.

It is a super-3 number, since 3×28388473³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28388873) 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 as a sum of consecutive naturals, namely, 14194236 + 14194237.

It is an arithmetic number, because the mean of its divisors is an integer number (14194237).

Almost surely, 2^28388473 is an apocalyptic number.

It is an amenable number.

28388473 is a deficient number, since it is larger than the sum of its proper divisors (1).

28388473 is an equidigital number, since it uses as much as digits as its factorization.

28388473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 28388473 is about 5328.0834265240. The cubic root of 28388473 is about 305.0567770320.

Subtracting 28388473 from its reverse (37488382), we obtain a palindrome (9099909).

It can be divided in two parts, 2838 and 8473, that added together give a palindrome (11311).

The spelling of 28388473 in words is "twenty-eight million, three hundred eighty-eight thousand, four hundred seventy-three".