28167220721603 has 8 divisors (see below), whose sum is σ = 30451049429520. Its totient is φ = 25963526354400.

The previous prime is 28167220721593. The next prime is 28167220721659. The reversal of 28167220721603 is 30612702276182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28167220721603 - 2¹⁶ = 28167220656067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28167220711603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20033584448 + ... + 20033585853.

It is an arithmetic number, because the mean of its divisors is an integer number (3806381178690).

Almost surely, 2^{28167220721603} is an apocalyptic number.

28167220721603 is a deficient number, since it is larger than the sum of its proper divisors (2283828707917).

28167220721603 is a wasteful number, since it uses less digits than its factorization.

28167220721603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40067170357.

The product of its (nonzero) digits is 677376, while the sum is 47.

Adding to 28167220721603 its reverse (30612702276182), we get a palindrome (58779922997785).

The spelling of 28167220721603 in words is "twenty-eight trillion, one hundred sixty-seven billion, two hundred twenty million, seven hundred twenty-one thousand, six hundred three".