28857739 has 2 divisors, whose sum is σ = 28857740. Its totient is φ = 28857738.

The previous prime is 28857733. The next prime is 28857779. The reversal of 28857739 is 93775882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28857739 - 2¹³ = 28849547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28857692 and 28857701.

It is not a weakly prime, because it can be changed into another prime (28857733) 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, 14428869 + 14428870.

It is an arithmetic number, because the mean of its divisors is an integer number (14428870).

Almost surely, 2^28857739 is an apocalyptic number.

28857739 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857739 is an equidigital number, since it uses as much as digits as its factorization.

28857739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 28857739 is about 5371.9399661575. The cubic root of 28857739 is about 306.7284785349.

The spelling of 28857739 in words is "twenty-eight million, eight hundred fifty-seven thousand, seven hundred thirty-nine".