28433389 has 2 divisors, whose sum is σ = 28433390. Its totient is φ = 28433388.

The previous prime is 28433371. The next prime is 28433407. The reversal of 28433389 is 98333482.

It is a balanced prime because it is at equal distance from previous prime (28433371) and next prime (28433407).

It can be written as a sum of positive squares in only one way, i.e., 18636489 + 9796900 = 4317^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 28433389 - 2⁵ = 28433357 is a prime.

It is a super-2 number, since 2×28433389² = 1616915220050642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28433089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216694 + 14216695.

It is an arithmetic number, because the mean of its divisors is an integer number (14216695).

Almost surely, 2^28433389 is an apocalyptic number.

It is an amenable number.

28433389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28433389 is an equidigital number, since it uses as much as digits as its factorization.

28433389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 28433389 is about 5332.2967846886. The cubic root of 28433389 is about 305.2175783331.

The spelling of 28433389 in words is "twenty-eight million, four hundred thirty-three thousand, three hundred eighty-nine".