28203245566 has 4 divisors (see below), whose sum is σ = 42304868352. Its totient is φ = 14101622782.

The previous prime is 28203245509. The next prime is 28203245569. The reversal of 28203245566 is 66554230282.

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 (28203245569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7050811390 + ... + 7050811393.

It is an arithmetic number, because the mean of its divisors is an integer number (10576217088).

Almost surely, 2^28203245566 is an apocalyptic number.

28203245566 is a deficient number, since it is larger than the sum of its proper divisors (14101622786).

28203245566 is a wasteful number, since it uses less digits than its factorization.

28203245566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14101622785.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 28203245566 in words is "twenty-eight billion, two hundred three million, two hundred forty-five thousand, five hundred sixty-six".