28012693 has 2 divisors, whose sum is σ = 28012694. Its totient is φ = 28012692.

The previous prime is 28012681. The next prime is 28012711. The reversal of 28012693 is 39621082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 13089924 = 3863^2 + 3618^2 .

It is a cyclic number.

It is not a de Polignac number, because 28012693 - 2⁹ = 28012181 is a prime.

It is a super-2 number, since 2×28012693² = 1569421938224498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28012613) 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, 14006346 + 14006347.

It is an arithmetic number, because the mean of its divisors is an integer number (14006347).

Almost surely, 2^28012693 is an apocalyptic number.

It is an amenable number.

28012693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28012693 is an equidigital number, since it uses as much as digits as its factorization.

28012693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28012693 is about 5292.7018619983. The cubic root of 28012693 is about 303.7047752841.

The spelling of 28012693 in words is "twenty-eight million, twelve thousand, six hundred ninety-three".