28736789 has 2 divisors, whose sum is σ = 28736790. Its totient is φ = 28736788.

The previous prime is 28736731. The next prime is 28736791. The reversal of 28736789 is 98763782.

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., 26728900 + 2007889 = 5170^2 + 1417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28736789 is a prime.

Together with 28736791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28736989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14368394 + 14368395.

It is an arithmetic number, because the mean of its divisors is an integer number (14368395).

Almost surely, 2^28736789 is an apocalyptic number.

It is an amenable number.

28736789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28736789 is an equidigital number, since it uses as much as digits as its factorization.

28736789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 28736789 is about 5360.6705737249. The cubic root of 28736789 is about 306.2993532012.

The spelling of 28736789 in words is "twenty-eight million, seven hundred thirty-six thousand, seven hundred eighty-nine".