28638299 has 2 divisors, whose sum is σ = 28638300. Its totient is φ = 28638298.

The previous prime is 28638293. The next prime is 28638307. The reversal of 28638299 is 99283682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28638299 is a prime.

It is a super-2 number, since 2×28638299² = 1640304339226802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28638293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14319149 + 14319150.

It is an arithmetic number, because the mean of its divisors is an integer number (14319150).

Almost surely, 2^28638299 is an apocalyptic number.

28638299 is a deficient number, since it is larger than the sum of its proper divisors (1).

28638299 is an equidigital number, since it uses as much as digits as its factorization.

28638299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 28638299 is about 5351.4763383575. The cubic root of 28638299 is about 305.9490246441.

The spelling of 28638299 in words is "twenty-eight million, six hundred thirty-eight thousand, two hundred ninety-nine".