28017161 has 4 divisors (see below), whose sum is σ = 28983300. Its totient is φ = 27051024.

The previous prime is 28017137. The next prime is 28017163. The reversal of 28017161 is 16171082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7946761 + 20070400 = 2819^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 28017161 - 2¹⁰ = 28016137 is a prime.

It is a super-2 number, since 2×28017161² = 1569922620999842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28017161.

It is not an unprimeable number, because it can be changed into a prime (28017163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483026 + ... + 483083.

It is an arithmetic number, because the mean of its divisors is an integer number (7245825).

Almost surely, 2^28017161 is an apocalyptic number.

It is an amenable number.

28017161 is a deficient number, since it is larger than the sum of its proper divisors (966139).

28017161 is an equidigital number, since it uses as much as digits as its factorization.

28017161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966138.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28017161 is about 5293.1239358247. The cubic root of 28017161 is about 303.7209213076.

The spelling of 28017161 in words is "twenty-eight million, seventeen thousand, one hundred sixty-one".