28681007 has 2 divisors, whose sum is σ = 28681008. Its totient is φ = 28681006.

The previous prime is 28681001. The next prime is 28681063. The reversal of 28681007 is 70018682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28681007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28681001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14340503 + 14340504.

It is an arithmetic number, because the mean of its divisors is an integer number (14340504).

Almost surely, 2^28681007 is an apocalyptic number.

28681007 is a deficient number, since it is larger than the sum of its proper divisors (1).

28681007 is an equidigital number, since it uses as much as digits as its factorization.

28681007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28681007 is about 5355.4651525334. The cubic root of 28681007 is about 306.1010353137.

Adding to 28681007 its reverse (70018682), we get a palindrome (98699689).

The spelling of 28681007 in words is "twenty-eight million, six hundred eighty-one thousand, seven".