28802281 has 2 divisors, whose sum is σ = 28802282. Its totient is φ = 28802280.

The previous prime is 28802273. The next prime is 28802287. The reversal of 28802281 is 18220882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 11162281 = 4200^2 + 3341^2 .

It is a cyclic number.

It is not a de Polignac number, because 28802281 - 2³ = 28802273 is a prime.

It is a super-2 number, since 2×28802281² = 1659142781605922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28802287) 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, 14401140 + 14401141.

It is an arithmetic number, because the mean of its divisors is an integer number (14401141).

Almost surely, 2^28802281 is an apocalyptic number.

It is an amenable number.

28802281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28802281 is an equidigital number, since it uses as much as digits as its factorization.

28802281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28802281 is about 5366.7756614191. The cubic root of 28802281 is about 306.5318651133.

The spelling of 28802281 in words is "twenty-eight million, eight hundred two thousand, two hundred eighty-one".