28910797 has 2 divisors, whose sum is σ = 28910798. Its totient is φ = 28910796.

The previous prime is 28910779. The next prime is 28910813. The reversal of 28910797 is 79701982.

It is a happy number.

Together with previous prime (28910779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24462916 + 4447881 = 4946^2 + 2109^2 .

It is a cyclic number.

It is not a de Polignac number, because 28910797 - 2⁷ = 28910669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28910737) 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, 14455398 + 14455399.

It is an arithmetic number, because the mean of its divisors is an integer number (14455399).

Almost surely, 2^28910797 is an apocalyptic number.

It is an amenable number.

28910797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28910797 is an equidigital number, since it uses as much as digits as its factorization.

28910797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28910797 is about 5376.8761376844. The cubic root of 28910797 is about 306.9163476737.

The spelling of 28910797 in words is "twenty-eight million, nine hundred ten thousand, seven hundred ninety-seven".