28024181 has 2 divisors, whose sum is σ = 28024182. Its totient is φ = 28024180.

The previous prime is 28024163. The next prime is 28024219. The reversal of 28024181 is 18142082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 8584900 = 4409^2 + 2930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28024181 is a prime.

It is a super-2 number, since 2×28024181² = 1570709441441522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28024181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28026181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14012090 + 14012091.

It is an arithmetic number, because the mean of its divisors is an integer number (14012091).

Almost surely, 2^28024181 is an apocalyptic number.

It is an amenable number.

28024181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28024181 is an equidigital number, since it uses as much as digits as its factorization.

28024181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28024181 is about 5293.7870187608. The cubic root of 28024181 is about 303.7462860334.

The spelling of 28024181 in words is "twenty-eight million, twenty-four thousand, one hundred eighty-one".