28871107225 has 27 divisors (see below), whose sum is σ = 38048975517. Its totient is φ = 21727370880.

The previous prime is 28871107217. The next prime is 28871107241. The reversal of 28871107225 is 52270117882.

The square root of 28871107225 is 169915.

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

It can be written as a sum of positive squares in 4 ways, for example, as 675324169 + 28195783056 = 25987^2 + 167916^2 .

It is not a de Polignac number, because 28871107225 - 2³ = 28871107217 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, 14441776 + ... + 14443774.

Almost surely, 2^28871107225 is an apocalyptic number.

28871107225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28871107225 is the 169915-th square number.

28871107225 is the 84958-th centered octagonal number.

It is an amenable number.

28871107225 is a deficient number, since it is larger than the sum of its proper divisors (9177868292).

28871107225 is an frugal number, since it uses more digits than its factorization.

28871107225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042 (or 2021 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 28871107225 in words is "twenty-eight billion, eight hundred seventy-one million, one hundred seven thousand, two hundred twenty-five".