28898081 has 2 divisors, whose sum is σ = 28898082. Its totient is φ = 28898080.

The previous prime is 28898063. The next prime is 28898099. The reversal of 28898081 is 18089882.

It is a balanced prime because it is at equal distance from previous prime (28898063) and next prime (28898099).

It can be written as a sum of positive squares in only one way, i.e., 22648081 + 6250000 = 4759^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28898081 is a prime.

It is a super-2 number, since 2×28898081² = 1670198170965122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28898041) 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, 14449040 + 14449041.

It is an arithmetic number, because the mean of its divisors is an integer number (14449041).

Almost surely, 2^28898081 is an apocalyptic number.

It is an amenable number.

28898081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28898081 is an equidigital number, since it uses as much as digits as its factorization.

28898081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 28898081 is about 5375.6935366518. The cubic root of 28898081 is about 306.8713434883.

The spelling of 28898081 in words is "twenty-eight million, eight hundred ninety-eight thousand, eighty-one".