28616797225 has 27 divisors (see below), whose sum is σ = 37119960759. Its totient is φ = 21883184400.

The previous prime is 28616797213. The next prime is 28616797241. The reversal of 28616797225 is 52279761682.

The square root of 28616797225 is 169165.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10302047001 + 18314750224 = 101499^2 + 135332^2 .

It is not a de Polignac number, because 28616797225 - 2⁹ = 28616796713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19453240 + ... + 19454710.

Almost surely, 2^28616797225 is an apocalyptic number.

28616797225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28616797225 is the 169165-th square number.

28616797225 is the 84583-rd centered octagonal number.

It is an amenable number.

28616797225 is a deficient number, since it is larger than the sum of its proper divisors (8503163534).

28616797225 is an frugal number, since it uses more digits than its factorization.

28616797225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998 (or 1499 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 55.

It can be divided in two parts, 2861 and 6797225, that added together give a palindrome (6800086).

The spelling of 28616797225 in words is "twenty-eight billion, six hundred sixteen million, seven hundred ninety-seven thousand, two hundred twenty-five".