28000073 has 2 divisors, whose sum is σ = 28000074. Its totient is φ = 28000072.

The previous prime is 28000069. The next prime is 28000087. The reversal of 28000073 is 37000082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23454649 + 4545424 = 4843^2 + 2132^2 .

It is a cyclic number.

It is not a de Polignac number, because 28000073 - 2² = 28000069 is a prime.

It is not a weakly prime, because it can be changed into another prime (28005073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000036 + 14000037.

It is an arithmetic number, because the mean of its divisors is an integer number (14000037).

Almost surely, 2^28000073 is an apocalyptic number.

It is an amenable number.

28000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000073 is an equidigital number, since it uses as much as digits as its factorization.

28000073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 28000073 is about 5291.5095199763. The cubic root of 28000073 is about 303.6591610814.

Subtracting 28000073 from its reverse (37000082), we obtain a palindrome (9000009).

The spelling of 28000073 in words is "twenty-eight million, seventy-three", and thus it is an aban number and an uban number.