28495681 has 2 divisors, whose sum is σ = 28495682. Its totient is φ = 28495680.

The previous prime is 28495673. The next prime is 28495693. The reversal of 28495681 is 18659482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 3094081 = 5040^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 28495681 - 2³ = 28495673 is a prime.

It is a super-2 number, since 2×28495681² = 1624007671307522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28495631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14247840 + 14247841.

It is an arithmetic number, because the mean of its divisors is an integer number (14247841).

Almost surely, 2^28495681 is an apocalyptic number.

It is an amenable number.

28495681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28495681 is an equidigital number, since it uses as much as digits as its factorization.

28495681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 28495681 is about 5338.1345992772. The cubic root of 28495681 is about 305.4403064545.

The spelling of 28495681 in words is "twenty-eight million, four hundred ninety-five thousand, six hundred eighty-one".