28672681 has 2 divisors, whose sum is σ = 28672682. Its totient is φ = 28672680.

The previous prime is 28672673. The next prime is 28672741. The reversal of 28672681 is 18627682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 6205081 = 4740^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 28672681 - 2³ = 28672673 is a prime.

It is a super-2 number, since 2×28672681² = 1644245271455522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28672601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14336340 + 14336341.

It is an arithmetic number, because the mean of its divisors is an integer number (14336341).

Almost surely, 2^28672681 is an apocalyptic number.

It is an amenable number.

28672681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28672681 is an equidigital number, since it uses as much as digits as its factorization.

28672681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 28672681 is about 5354.6877593376. The cubic root of 28672681 is about 306.0714124129.

The spelling of 28672681 in words is "twenty-eight million, six hundred seventy-two thousand, six hundred eighty-one".