28162681 has 2 divisors, whose sum is σ = 28162682. Its totient is φ = 28162680.

The previous prime is 28162637. The next prime is 28162691. The reversal of 28162681 is 18626182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22325625 + 5837056 = 4725^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 28162681 - 2⁷ = 28162553 is a prime.

It is a super-2 number, since 2×28162681² = 1586273202215522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28162691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081340 + 14081341.

It is an arithmetic number, because the mean of its divisors is an integer number (14081341).

Almost surely, 2^28162681 is an apocalyptic number.

It is an amenable number.

28162681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28162681 is an equidigital number, since it uses as much as digits as its factorization.

28162681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 28162681 is about 5306.8522685298. The cubic root of 28162681 is about 304.2458515882.

The spelling of 28162681 in words is "twenty-eight million, one hundred sixty-two thousand, six hundred eighty-one".