28018481 has 2 divisors, whose sum is σ = 28018482. Its totient is φ = 28018480.

The previous prime is 28018469. The next prime is 28018493. The reversal of 28018481 is 18481082.

It is a balanced prime because it is at equal distance from previous prime (28018469) and next prime (28018493).

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 12138256 = 3985^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018481 - 2¹⁴ = 28002097 is a prime.

It is a super-2 number, since 2×28018481² = 1570070555094722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28018181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009240 + 14009241.

It is an arithmetic number, because the mean of its divisors is an integer number (14009241).

Almost surely, 2^28018481 is an apocalyptic number.

It is an amenable number.

28018481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28018481 is an equidigital number, since it uses as much as digits as its factorization.

28018481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 28018481 is about 5293.2486244272. The cubic root of 28018481 is about 303.7256910666.

The spelling of 28018481 in words is "twenty-eight million, eighteen thousand, four hundred eighty-one".