28816397 has 2 divisors, whose sum is σ = 28816398. Its totient is φ = 28816396.

The previous prime is 28816379. The next prime is 28816409. The reversal of 28816397 is 79361882.

Together with previous prime (28816379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 13402921 = 3926^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 28816397 - 2¹⁰ = 28815373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28816357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14408198 + 14408199.

It is an arithmetic number, because the mean of its divisors is an integer number (14408199).

Almost surely, 2^28816397 is an apocalyptic number.

It is an amenable number.

28816397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28816397 is an equidigital number, since it uses as much as digits as its factorization.

28816397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 28816397 is about 5368.0906288922. The cubic root of 28816397 is about 306.5819340310.

The spelling of 28816397 in words is "twenty-eight million, eight hundred sixteen thousand, three hundred ninety-seven".