28170581225 has 6 divisors (see below), whose sum is σ = 34931520750. Its totient is φ = 22536464960.

The previous prime is 28170581213. The next prime is 28170581239. The reversal of 28170581225 is 52218507182.

It can be written as a sum of positive squares in 3 ways, for example, as 462981289 + 27707599936 = 21517^2 + 166456^2 .

It is not a de Polignac number, because 28170581225 - 2⁴ = 28170581209 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 563411600 + ... + 563411649.

It is an arithmetic number, because the mean of its divisors is an integer number (5821920125).

Almost surely, 2^28170581225 is an apocalyptic number.

28170581225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28170581225 is a deficient number, since it is larger than the sum of its proper divisors (6760939525).

28170581225 is a wasteful number, since it uses less digits than its factorization.

28170581225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126823259 (or 1126823254 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 28170581225 in words is "twenty-eight billion, one hundred seventy million, five hundred eighty-one thousand, two hundred twenty-five".