28680749 has 2 divisors, whose sum is σ = 28680750. Its totient is φ = 28680748.

The previous prime is 28680721. The next prime is 28680761. The reversal of 28680749 is 94708682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 1170724 = 5245^2 + 1082^2 .

It is a cyclic number.

It is not a de Polignac number, because 28680749 - 2⁸ = 28680493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28680779) 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, 14340374 + 14340375.

It is an arithmetic number, because the mean of its divisors is an integer number (14340375).

Almost surely, 2^28680749 is an apocalyptic number.

It is an amenable number.

28680749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28680749 is an equidigital number, since it uses as much as digits as its factorization.

28680749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28680749 is about 5355.4410649357. The cubic root of 28680749 is about 306.1001174670.

The spelling of 28680749 in words is "twenty-eight million, six hundred eighty thousand, seven hundred forty-nine".