28013261 has 2 divisors, whose sum is σ = 28013262. Its totient is φ = 28013260.

The previous prime is 28013233. The next prime is 28013311. The reversal of 28013261 is 16231082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 12292036 = 3965^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28013261 - 2¹⁴ = 27996877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28013221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006630 + 14006631.

It is an arithmetic number, because the mean of its divisors is an integer number (14006631).

Almost surely, 2^28013261 is an apocalyptic number.

It is an amenable number.

28013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28013261 is an equidigital number, since it uses as much as digits as its factorization.

28013261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28013261 is about 5292.7555205205. The cubic root of 28013261 is about 303.7068279625.

The spelling of 28013261 in words is "twenty-eight million, thirteen thousand, two hundred sixty-one".