28161922252826 has 16 divisors (see below), whose sum is σ = 42797186507304. Its totient is φ = 13897381634304.

The previous prime is 28161922252757. The next prime is 28161922252847. The reversal of 28161922252826 is 62825222916182.

It can be written as a sum of positive squares in 4 ways, for example, as 27979349781601 + 182572471225 = 5289551^2 + 427285^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297006755 + ... + 297101558.

Almost surely, 2^{28161922252826} is an apocalyptic number.

28161922252826 is a deficient number, since it is larger than the sum of its proper divisors (14635264254478).

28161922252826 is a wasteful number, since it uses less digits than its factorization.

28161922252826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594108625.

The product of its digits is 6635520, while the sum is 56.

The spelling of 28161922252826 in words is "twenty-eight trillion, one hundred sixty-one billion, nine hundred twenty-two million, two hundred fifty-two thousand, eight hundred twenty-six".