28426789 has 2 divisors, whose sum is σ = 28426790. Its totient is φ = 28426788.

The previous prime is 28426787. The next prime is 28426813. The reversal of 28426789 is 98762482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 1542564 = 5185^2 + 1242^2 .

It is a cyclic number.

It is not a de Polignac number, because 28426789 - 2¹ = 28426787 is a prime.

Together with 28426787, 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 (28426787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14213394 + 14213395.

It is an arithmetic number, because the mean of its divisors is an integer number (14213395).

Almost surely, 2^28426789 is an apocalyptic number.

It is an amenable number.

28426789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28426789 is an equidigital number, since it uses as much as digits as its factorization.

28426789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 28426789 is about 5331.6778784919. The cubic root of 28426789 is about 305.1939606548.

The spelling of 28426789 in words is "twenty-eight million, four hundred twenty-six thousand, seven hundred eighty-nine".