28338261 has 16 divisors (see below), whose sum is σ = 43305600. Its totient is φ = 16147008.

The previous prime is 28338251. The next prime is 28338281. The reversal of 28338261 is 16283382.

It is not a de Polignac number, because 28338261 - 2⁵ = 28338229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28338251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6435 + ... + 9903.

It is an arithmetic number, because the mean of its divisors is an integer number (2706600).

Almost surely, 2^28338261 is an apocalyptic number.

28338261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28338261 is a deficient number, since it is larger than the sum of its proper divisors (14967339).

28338261 is a wasteful number, since it uses less digits than its factorization.

28338261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868.

The product of its digits is 13824, while the sum is 33.

The square root of 28338261 is about 5323.3693277848. The cubic root of 28338261 is about 304.8768148961.

The spelling of 28338261 in words is "twenty-eight million, three hundred thirty-eight thousand, two hundred sixty-one".