28670261 has 2 divisors, whose sum is σ = 28670262. Its totient is φ = 28670260.

The previous prime is 28670209. The next prime is 28670287. The reversal of 28670261 is 16207682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 8375236 = 4505^2 + 2894^2 .

It is a cyclic number.

It is not a de Polignac number, because 28670261 - 2⁶ = 28670197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28670561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14335130 + 14335131.

It is an arithmetic number, because the mean of its divisors is an integer number (14335131).

Almost surely, 2^28670261 is an apocalyptic number.

It is an amenable number.

28670261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28670261 is an equidigital number, since it uses as much as digits as its factorization.

28670261 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 28670261 is about 5354.4617843440. The cubic root of 28670261 is about 306.0628012700.

The spelling of 28670261 in words is "twenty-eight million, six hundred seventy thousand, two hundred sixty-one".