28343506 has 4 divisors (see below), whose sum is σ = 42515262. Its totient is φ = 14171752.

The previous prime is 28343489. The next prime is 28343507. The reversal of 28343506 is 60534382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16475481 + 11868025 = 4059^2 + 3445^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28343507) 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, 7085875 + ... + 7085878.

Almost surely, 2^28343506 is an apocalyptic number.

28343506 is a deficient number, since it is larger than the sum of its proper divisors (14171756).

28343506 is a wasteful number, since it uses less digits than its factorization.

28343506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14171755.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 28343506 is about 5323.8619441154. The cubic root of 28343506 is about 304.8956231574.

Adding to 28343506 its reverse (60534382), we get a palindrome (88877888).

The spelling of 28343506 in words is "twenty-eight million, three hundred forty-three thousand, five hundred six".