28990261 has 2 divisors, whose sum is σ = 28990262. Its totient is φ = 28990260.

The previous prime is 28990229. The next prime is 28990267. The reversal of 28990261 is 16209982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 11088900 = 4231^2 + 3330^2 .

It is a cyclic number.

It is not a de Polignac number, because 28990261 - 2⁵ = 28990229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28990261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28990267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14495130 + 14495131.

It is an arithmetic number, because the mean of its divisors is an integer number (14495131).

Almost surely, 2^28990261 is an apocalyptic number.

It is an amenable number.

28990261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28990261 is an equidigital number, since it uses as much as digits as its factorization.

28990261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 28990261 is about 5384.2604877550. The cubic root of 28990261 is about 307.1972864265.

The spelling of 28990261 in words is "twenty-eight million, nine hundred ninety thousand, two hundred sixty-one".