28159844362225 has 9 divisors (see below), whose sum is σ = 34918239910017. Its totient is φ = 22527854263440.

The previous prime is 28159844362217. The next prime is 28159844362283. The reversal of 28159844362225 is 52226344895182.

The square root of 28159844362225 is 5306585.

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

28159844362225 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5246926240689 + 22912918121536 = 2290617^2 + 4786744^2 .

It is not a de Polignac number, because 28159844362225 - 2³ = 28159844362217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26002267 + ... + 27063583.

Almost surely, 2^{28159844362225} is an apocalyptic number.

28159844362225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28159844362225 is the 5306585-th square number.

28159844362225 is the 2653293-rd centered octagonal number.

It is an amenable number.

28159844362225 is a deficient number, since it is larger than the sum of its proper divisors (6758395547792).

28159844362225 is an frugal number, since it uses more digits than its factorization.

28159844362225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122644 (or 1061322 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 61.

The spelling of 28159844362225 in words is "twenty-eight trillion, one hundred fifty-nine billion, eight hundred forty-four million, three hundred sixty-two thousand, two hundred twenty-five".