28104997 has 2 divisors, whose sum is σ = 28104998. Its totient is φ = 28104996.

The previous prime is 28104911. The next prime is 28105001. The reversal of 28104997 is 79940182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 13351716 = 3841^2 + 3654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28104997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28404997) 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, 14052498 + 14052499.

It is an arithmetic number, because the mean of its divisors is an integer number (14052499).

Almost surely, 2^28104997 is an apocalyptic number.

It is an amenable number.

28104997 is a deficient number, since it is larger than the sum of its proper divisors (1).

28104997 is an equidigital number, since it uses as much as digits as its factorization.

28104997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 28104997 is about 5301.4146225324. The cubic root of 28104997 is about 304.0379865101.

The spelling of 28104997 in words is "twenty-eight million, one hundred four thousand, nine hundred ninety-seven".