28657807 has 2 divisors, whose sum is σ = 28657808. Its totient is φ = 28657806.

The previous prime is 28657763. The next prime is 28657847. The reversal of 28657807 is 70875682.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28657807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28657847) 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, 14328903 + 14328904.

It is an arithmetic number, because the mean of its divisors is an integer number (14328904).

Almost surely, 2^28657807 is an apocalyptic number.

28657807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28657807 is an equidigital number, since it uses as much as digits as its factorization.

28657807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28657807 is about 5353.2987026692. The cubic root of 28657807 is about 306.0184782439.

The spelling of 28657807 in words is "twenty-eight million, six hundred fifty-seven thousand, eight hundred seven".