28330261 has 2 divisors, whose sum is σ = 28330262. Its totient is φ = 28330260.

The previous prime is 28330243. The next prime is 28330297. The reversal of 28330261 is 16203382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 3976036 = 4935^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 28330261 - 2⁵ = 28330229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28330201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14165130 + 14165131.

It is an arithmetic number, because the mean of its divisors is an integer number (14165131).

Almost surely, 2^28330261 is an apocalyptic number.

It is an amenable number.

28330261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28330261 is an equidigital number, since it uses as much as digits as its factorization.

28330261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 28330261 is about 5322.6178709353. The cubic root of 28330261 is about 304.8481228971.

The spelling of 28330261 in words is "twenty-eight million, three hundred thirty thousand, two hundred sixty-one".