28358389 has 2 divisors, whose sum is σ = 28358390. Its totient is φ = 28358388.

The previous prime is 28358387. The next prime is 28358399. The reversal of 28358389 is 98385382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 1918225 = 5142^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28358389 - 2¹ = 28358387 is a prime.

Together with 28358387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28358381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14179194 + 14179195.

It is an arithmetic number, because the mean of its divisors is an integer number (14179195).

Almost surely, 2^28358389 is an apocalyptic number.

It is an amenable number.

28358389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28358389 is an equidigital number, since it uses as much as digits as its factorization.

28358389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 28358389 is about 5325.2595241922. The cubic root of 28358389 is about 304.9489800891.

The spelling of 28358389 in words is "twenty-eight million, three hundred fifty-eight thousand, three hundred eighty-nine".