28873588762225 has 9 divisors (see below), whose sum is σ = 35803283380363. Its totient is φ = 23098849516120.

The previous prime is 28873588762223. The next prime is 28873588762301. The reversal of 28873588762225 is 52226788537882.

The square root of 28873588762225 is 5373415.

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., 10394491954401 + 18479096807824 = 3224049^2 + 4298732^2 .

It is not a de Polignac number, because 28873588762225 - 2¹ = 28873588762223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28873588762223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26329734 + ... + 27404416.

Almost surely, 2^{28873588762225} is an apocalyptic number.

28873588762225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28873588762225 is the 5373415-th square number.

28873588762225 is the 2686708-th centered octagonal number.

It is an amenable number.

28873588762225 is a deficient number, since it is larger than the sum of its proper divisors (6929694618138).

28873588762225 is an frugal number, since it uses more digits than its factorization.

28873588762225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149376 (or 1074688 counting only the distinct ones).

The product of its digits is 1445068800, while the sum is 73.

The spelling of 28873588762225 in words is "twenty-eight trillion, eight hundred seventy-three billion, five hundred eighty-eight million, seven hundred sixty-two thousand, two hundred twenty-five".