28687697 has 2 divisors, whose sum is σ = 28687698. Its totient is φ = 28687696.

The previous prime is 28687667. The next prime is 28687717. The reversal of 28687697 is 79678682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 961 = 5356^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 28687697 - 2⁸ = 28687441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28687667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343848 + 14343849.

It is an arithmetic number, because the mean of its divisors is an integer number (14343849).

Almost surely, 2^28687697 is an apocalyptic number.

It is an amenable number.

28687697 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687697 is an equidigital number, since it uses as much as digits as its factorization.

28687697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The square root of 28687697 is about 5356.0897117207. The cubic root of 28687697 is about 306.1248333708.

The spelling of 28687697 in words is "twenty-eight million, six hundred eighty-seven thousand, six hundred ninety-seven".