28643206 has 4 divisors (see below), whose sum is σ = 42964812. Its totient is φ = 14321602.

The previous prime is 28643201. The next prime is 28643207. The reversal of 28643206 is 60234682.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643201) 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, 7160800 + ... + 7160803.

It is an arithmetic number, because the mean of its divisors is an integer number (10741203).

Almost surely, 2^28643206 is an apocalyptic number.

28643206 is a deficient number, since it is larger than the sum of its proper divisors (14321606).

28643206 is a wasteful number, since it uses less digits than its factorization.

28643206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14321605.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 28643206 is about 5351.9347903352. The cubic root of 28643206 is about 305.9664978202.

Adding to 28643206 its reverse (60234682), we get a palindrome (88877888).

The spelling of 28643206 in words is "twenty-eight million, six hundred forty-three thousand, two hundred six".