28785749 has 2 divisors, whose sum is σ = 28785750. Its totient is φ = 28785748.

The previous prime is 28785739. The next prime is 28785767. The reversal of 28785749 is 94758782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 1170724 = 5255^2 + 1082^2 .

It is a cyclic number.

It is not a de Polignac number, because 28785749 - 2¹² = 28781653 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28785697 and 28785706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28785739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392874 + 14392875.

It is an arithmetic number, because the mean of its divisors is an integer number (14392875).

Almost surely, 2^28785749 is an apocalyptic number.

It is an amenable number.

28785749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785749 is an equidigital number, since it uses as much as digits as its factorization.

28785749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 28785749 is about 5365.2352231752. The cubic root of 28785749 is about 306.4732059320.

The spelling of 28785749 in words is "twenty-eight million, seven hundred eighty-five thousand, seven hundred forty-nine".