28250728097 has 2 divisors, whose sum is σ = 28250728098. Its totient is φ = 28250728096.

The previous prime is 28250728069. The next prime is 28250728127. The reversal of 28250728097 is 79082705282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24687951376 + 3562776721 = 157124^2 + 59689^2 .

It is a cyclic number.

It is not a de Polignac number, because 28250728097 - 2²² = 28246533793 is a prime.

It is not a weakly prime, because it can be changed into another prime (28250728997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14125364048 + 14125364049.

It is an arithmetic number, because the mean of its divisors is an integer number (14125364049).

Almost surely, 2^28250728097 is an apocalyptic number.

It is an amenable number.

28250728097 is a deficient number, since it is larger than the sum of its proper divisors (1).

28250728097 is an equidigital number, since it uses as much as digits as its factorization.

28250728097 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 28250728097 in words is "twenty-eight billion, two hundred fifty million, seven hundred twenty-eight thousand, ninety-seven".