28894681 has 2 divisors, whose sum is σ = 28894682. Its totient is φ = 28894680.

The previous prime is 28894673. The next prime is 28894703. The reversal of 28894681 is 18649882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 13995081 = 3860^2 + 3741^2 .

It is a cyclic number.

It is not a de Polignac number, because 28894681 - 2³ = 28894673 is a prime.

It is a super-2 number, since 2×28894681² = 1669805180183522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28894631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14447340 + 14447341.

It is an arithmetic number, because the mean of its divisors is an integer number (14447341).

Almost surely, 2^28894681 is an apocalyptic number.

It is an amenable number.

28894681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28894681 is an equidigital number, since it uses as much as digits as its factorization.

28894681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 46.

The square root of 28894681 is about 5375.3772890840. The cubic root of 28894681 is about 306.8593080468.

The spelling of 28894681 in words is "twenty-eight million, eight hundred ninety-four thousand, six hundred eighty-one".