28663357 has 2 divisors, whose sum is σ = 28663358. Its totient is φ = 28663356.

The previous prime is 28663319. The next prime is 28663361. The reversal of 28663357 is 75336682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27604516 + 1058841 = 5254^2 + 1029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28663357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28663367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14331678 + 14331679.

It is an arithmetic number, because the mean of its divisors is an integer number (14331679).

Almost surely, 2^28663357 is an apocalyptic number.

It is an amenable number.

28663357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28663357 is an equidigital number, since it uses as much as digits as its factorization.

28663357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 28663357 is about 5353.8170495451. The cubic root of 28663357 is about 306.0382319411.

The spelling of 28663357 in words is "twenty-eight million, six hundred sixty-three thousand, three hundred fifty-seven".