28004297 has 2 divisors, whose sum is σ = 28004298. Its totient is φ = 28004296.

The previous prime is 28004293. The next prime is 28004323. The reversal of 28004297 is 79240082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17480761 + 10523536 = 4181^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 28004297 - 2² = 28004293 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28004293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14002148 + 14002149.

It is an arithmetic number, because the mean of its divisors is an integer number (14002149).

Almost surely, 2^28004297 is an apocalyptic number.

It is an amenable number.

28004297 is a deficient number, since it is larger than the sum of its proper divisors (1).

28004297 is an equidigital number, since it uses as much as digits as its factorization.

28004297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28004297 is about 5291.9086348878. The cubic root of 28004297 is about 303.6744299916.

The spelling of 28004297 in words is "twenty-eight million, four thousand, two hundred ninety-seven".