28735691 has 2 divisors, whose sum is σ = 28735692. Its totient is φ = 28735690.

The previous prime is 28735669. The next prime is 28735709. The reversal of 28735691 is 19653782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28735691 - 2¹⁸ = 28473547 is a prime.

It is not a weakly prime, because it can be changed into another prime (28735621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14367845 + 14367846.

It is an arithmetic number, because the mean of its divisors is an integer number (14367846).

Almost surely, 2^28735691 is an apocalyptic number.

28735691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28735691 is an equidigital number, since it uses as much as digits as its factorization.

28735691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 28735691 is about 5360.5681601860. The cubic root of 28735691 is about 306.2954520350.

The spelling of 28735691 in words is "twenty-eight million, seven hundred thirty-five thousand, six hundred ninety-one".