28738261 has 2 divisors, whose sum is σ = 28738262. Its totient is φ = 28738260.

The previous prime is 28738231. The next prime is 28738289. The reversal of 28738261 is 16283782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23097636 + 5640625 = 4806^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 28738261 - 2⁹ = 28737749 is a prime.

It is equal to p_1784485 and since 28738261 and 1784485 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28738261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28738231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14369130 + 14369131.

It is an arithmetic number, because the mean of its divisors is an integer number (14369131).

Almost surely, 2^28738261 is an apocalyptic number.

It is an amenable number.

28738261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28738261 is an equidigital number, since it uses as much as digits as its factorization.

28738261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 28738261 is about 5360.8078682228. The cubic root of 28738261 is about 306.3045830241.

The spelling of 28738261 in words is "twenty-eight million, seven hundred thirty-eight thousand, two hundred sixty-one".