28161769 has 2 divisors, whose sum is σ = 28161770. Its totient is φ = 28161768.

The previous prime is 28161767. The next prime is 28161779. The reversal of 28161769 is 96716182.

28161769 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22686169 + 5475600 = 4763^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 28161769 - 2¹ = 28161767 is a prime.

It is a super-2 number, since 2×28161769² = 1586170466418722, which contains 22 as substring.

Together with 28161767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28161767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14080884 + 14080885.

It is an arithmetic number, because the mean of its divisors is an integer number (14080885).

Almost surely, 2^28161769 is an apocalyptic number.

It is an amenable number.

28161769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28161769 is an equidigital number, since it uses as much as digits as its factorization.

28161769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 28161769 is about 5306.7663411912. The cubic root of 28161769 is about 304.2425673931.

The spelling of 28161769 in words is "twenty-eight million, one hundred sixty-one thousand, seven hundred sixty-nine".