28280417749 has 2 divisors, whose sum is σ = 28280417750. Its totient is φ = 28280417748.

The previous prime is 28280417747. The next prime is 28280417797. The reversal of 28280417749 is 94771408282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28150799524 + 129618225 = 167782^2 + 11385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28280417749 - 2¹ = 28280417747 is a prime.

Together with 28280417747, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28280417696 and 28280417705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28280417747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140208874 + 14140208875.

It is an arithmetic number, because the mean of its divisors is an integer number (14140208875).

Almost surely, 2^28280417749 is an apocalyptic number.

It is an amenable number.

28280417749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280417749 is an equidigital number, since it uses as much as digits as its factorization.

28280417749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 28280417749 in words is "twenty-eight billion, two hundred eighty million, four hundred seventeen thousand, seven hundred forty-nine".