28171944025 has 9 divisors (see below), whose sum is σ = 34934251261. Its totient is φ = 22536883840.

The previous prime is 28171943983. The next prime is 28171944049. The reversal of 28171944025 is 52044917182.

The square root of 28171944025 is 167845.

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 10915443529 + 17256500496 = 104477^2 + 131364^2 .

It is not a de Polignac number, because 28171944025 - 2¹³ = 28171935833 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 8 ways as a sum of consecutive naturals, for example, 822441 + ... + 856009.

Almost surely, 2^28171944025 is an apocalyptic number.

28171944025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28171944025 is the 167845-th square number.

28171944025 is the 83923-rd centered octagonal number.

It is an amenable number.

28171944025 is a deficient number, since it is larger than the sum of its proper divisors (6762307236).

28171944025 is an frugal number, since it uses more digits than its factorization.

28171944025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67148 (or 33574 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

It can be divided in two parts, 28171 and 944025, that added together give a square (972196 = 986²).

The spelling of 28171944025 in words is "twenty-eight billion, one hundred seventy-one million, nine hundred forty-four thousand, twenty-five".