28433729 has 2 divisors, whose sum is σ = 28433730. Its totient is φ = 28433728.

The previous prime is 28433711. The next prime is 28433737. The reversal of 28433729 is 92733482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26543104 + 1890625 = 5152^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 28433729 - 2⁸ = 28433473 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28433692 and 28433701.

It is not a weakly prime, because it can be changed into another prime (28433749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216864 + 14216865.

It is an arithmetic number, because the mean of its divisors is an integer number (14216865).

Almost surely, 2^28433729 is an apocalyptic number.

It is an amenable number.

28433729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28433729 is an equidigital number, since it uses as much as digits as its factorization.

28433729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 28433729 is about 5332.3286657895. The cubic root of 28433729 is about 305.2187949023.

The spelling of 28433729 in words is "twenty-eight million, four hundred thirty-three thousand, seven hundred twenty-nine".