28220206 has 32 divisors (see below), whose sum is σ = 51240960. Its totient is φ = 11386656.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220206 is 60202282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73491 + ... + 73873.

It is an arithmetic number, because the mean of its divisors is an integer number (1601280).

Almost surely, 2^28220206 is an apocalyptic number.

28220206 is a deficient number, since it is larger than the sum of its proper divisors (23020754).

28220206 is a wasteful number, since it uses less digits than its factorization.

28220206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28220206 is about 5312.2693832297. The cubic root of 28220206 is about 304.4528612331.

Adding to 28220206 its reverse (60202282), we get a palindrome (88422488).

The spelling of 28220206 in words is "twenty-eight million, two hundred twenty thousand, two hundred six".