28625879 has 2 divisors, whose sum is σ = 28625880. Its totient is φ = 28625878.

The previous prime is 28625843. The next prime is 28625881. The reversal of 28625879 is 97852682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28625879 - 2¹² = 28621783 is a prime.

It is a Sophie Germain prime.

Together with 28625881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28625809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14312939 + 14312940.

It is an arithmetic number, because the mean of its divisors is an integer number (14312940).

Almost surely, 2^28625879 is an apocalyptic number.

28625879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28625879 is an equidigital number, since it uses as much as digits as its factorization.

28625879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 28625879 is about 5350.3157850729. The cubic root of 28625879 is about 305.9047897504.

The spelling of 28625879 in words is "twenty-eight million, six hundred twenty-five thousand, eight hundred seventy-nine".