28061275225 has 9 divisors (see below), whose sum is σ = 34797019903. Its totient is φ = 22448350120.

The previous prime is 28061275217. The next prime is 28061275247. The reversal of 28061275225 is 52257216082.

The square root of 28061275225 is 167515.

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., 10102059081 + 17959216144 = 100509^2 + 134012^2 .

It is not a de Polignac number, because 28061275225 - 2³ = 28061275217 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, 820824 + ... + 854326.

Almost surely, 2^28061275225 is an apocalyptic number.

28061275225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28061275225 is the 167515-th square number.

28061275225 is the 83758-th centered octagonal number.

It is an amenable number.

28061275225 is a deficient number, since it is larger than the sum of its proper divisors (6735744678).

28061275225 is an frugal number, since it uses more digits than its factorization.

28061275225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67016 (or 33508 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 28061275225 in words is "twenty-eight billion, sixty-one million, two hundred seventy-five thousand, two hundred twenty-five".