28961243 has 2 divisors, whose sum is σ = 28961244. Its totient is φ = 28961242.

The previous prime is 28961239. The next prime is 28961281. The reversal of 28961243 is 34216982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28961243 - 2² = 28961239 is a prime.

It is a super-2 number, since 2×28961243² = 1677507192210098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28961213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480621 + 14480622.

It is an arithmetic number, because the mean of its divisors is an integer number (14480622).

Almost surely, 2^28961243 is an apocalyptic number.

28961243 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961243 is an equidigital number, since it uses as much as digits as its factorization.

28961243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 28961243 is about 5381.5651069182. The cubic root of 28961243 is about 307.0947551342.

The spelling of 28961243 in words is "twenty-eight million, nine hundred sixty-one thousand, two hundred forty-three".