28303081 has 2 divisors, whose sum is σ = 28303082. Its totient is φ = 28303080.

The previous prime is 28303057. The next prime is 28303091. The reversal of 28303081 is 18030382.

28303081 is nontrivially palindromic in base 8.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 10830681 = 4180^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 28303081 - 2¹⁵ = 28270313 is a prime.

It is a super-2 number, since 2×28303081² = 1602128788185122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28303021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14151540 + 14151541.

It is an arithmetic number, because the mean of its divisors is an integer number (14151541).

Almost surely, 2^28303081 is an apocalyptic number.

It is an amenable number.

28303081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28303081 is an equidigital number, since it uses as much as digits as its factorization.

28303081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28303081 is about 5320.0640033744. The cubic root of 28303081 is about 304.7506014614.

The spelling of 28303081 in words is "twenty-eight million, three hundred three thousand, eighty-one".