28208161 has 2 divisors, whose sum is σ = 28208162. Its totient is φ = 28208160.

The previous prime is 28208153. The next prime is 28208177. The reversal of 28208161 is 16180282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 12645136 = 3945^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 28208161 - 2³ = 28208153 is a prime.

It is not a weakly prime, because it can be changed into another prime (28208101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104080 + 14104081.

It is an arithmetic number, because the mean of its divisors is an integer number (14104081).

Almost surely, 2^28208161 is an apocalyptic number.

It is an amenable number.

28208161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208161 is an equidigital number, since it uses as much as digits as its factorization.

28208161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28208161 is about 5311.1355659595. The cubic root of 28208161 is about 304.4095393597.

The spelling of 28208161 in words is "twenty-eight million, two hundred eight thousand, one hundred sixty-one".