28657879 has 2 divisors, whose sum is σ = 28657880. Its totient is φ = 28657878.

The previous prime is 28657873. The next prime is 28657897. The reversal of 28657879 is 97875682.

Together with next prime (28657897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28657879 - 2⁵ = 28657847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28657873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14328939 + 14328940.

It is an arithmetic number, because the mean of its divisors is an integer number (14328940).

Almost surely, 2^28657879 is an apocalyptic number.

28657879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28657879 is an equidigital number, since it uses as much as digits as its factorization.

28657879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 28657879 is about 5353.3054274906. The cubic root of 28657879 is about 306.0187345244.

The spelling of 28657879 in words is "twenty-eight million, six hundred fifty-seven thousand, eight hundred seventy-nine".