28320373 has 2 divisors, whose sum is σ = 28320374. Its totient is φ = 28320372.

The previous prime is 28320349. The next prime is 28320403. The reversal of 28320373 is 37302382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 12376324 = 3993^2 + 3518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28320373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28320323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160186 + 14160187.

It is an arithmetic number, because the mean of its divisors is an integer number (14160187).

Almost surely, 2^28320373 is an apocalyptic number.

It is an amenable number.

28320373 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320373 is an equidigital number, since it uses as much as digits as its factorization.

28320373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 28320373 is about 5321.6889236407. The cubic root of 28320373 is about 304.8126521214.

Subtracting 28320373 from its reverse (37302382), we obtain a square (8982009 = 2997²).

The spelling of 28320373 in words is "twenty-eight million, three hundred twenty thousand, three hundred seventy-three".