28413857 has 2 divisors, whose sum is σ = 28413858. Its totient is φ = 28413856.

The previous prime is 28413799. The next prime is 28413859. The reversal of 28413857 is 75831482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 5527201 = 4784^2 + 2351^2 .

It is a cyclic number.

It is not a de Polignac number, because 28413857 - 2⁸ = 28413601 is a prime.

Together with 28413859, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28413857.

It is not a weakly prime, because it can be changed into another prime (28413859) 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, 14206928 + 14206929.

It is an arithmetic number, because the mean of its divisors is an integer number (14206929).

Almost surely, 2^28413857 is an apocalyptic number.

It is an amenable number.

28413857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28413857 is an equidigital number, since it uses as much as digits as its factorization.

28413857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The square root of 28413857 is about 5330.4649890980. The cubic root of 28413857 is about 305.1476737181.

It can be divided in two parts, 284 and 13857, that added together give a palindrome (14141).

The spelling of 28413857 in words is "twenty-eight million, four hundred thirteen thousand, eight hundred fifty-seven".