28680761 has 2 divisors, whose sum is σ = 28680762. Its totient is φ = 28680760.

The previous prime is 28680749. The next prime is 28680779. The reversal of 28680761 is 16708682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22505536 + 6175225 = 4744^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 28680761 - 2⁶ = 28680697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28680721) 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, 14340380 + 14340381.

It is an arithmetic number, because the mean of its divisors is an integer number (14340381).

Almost surely, 2^28680761 is an apocalyptic number.

It is an amenable number.

28680761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28680761 is an equidigital number, since it uses as much as digits as its factorization.

28680761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28680761 is about 5355.4421852915. The cubic root of 28680761 is about 306.1001601577.

The spelling of 28680761 in words is "twenty-eight million, six hundred eighty thousand, seven hundred sixty-one".