28336081 has 2 divisors, whose sum is σ = 28336082. Its totient is φ = 28336080.

The previous prime is 28336073. The next prime is 28336111. The reversal of 28336081 is 18063382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22953681 + 5382400 = 4791^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 28336081 - 2³ = 28336073 is a prime.

It is a super-2 number, since 2×28336081² = 1605866972877122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28336051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14168040 + 14168041.

It is an arithmetic number, because the mean of its divisors is an integer number (14168041).

Almost surely, 2^28336081 is an apocalyptic number.

It is an amenable number.

28336081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28336081 is an equidigital number, since it uses as much as digits as its factorization.

28336081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28336081 is about 5323.1645663083. The cubic root of 28336081 is about 304.8689968617.

The spelling of 28336081 in words is "twenty-eight million, three hundred thirty-six thousand, eighty-one".