28617893 has 2 divisors, whose sum is σ = 28617894. Its totient is φ = 28617892.

The previous prime is 28617889. The next prime is 28617907. The reversal of 28617893 is 39871682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14615329 + 14002564 = 3823^2 + 3742^2 .

It is a cyclic number.

It is not a de Polignac number, because 28617893 - 2² = 28617889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28617863) 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, 14308946 + 14308947.

It is an arithmetic number, because the mean of its divisors is an integer number (14308947).

Almost surely, 2^28617893 is an apocalyptic number.

It is an amenable number.

28617893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28617893 is an equidigital number, since it uses as much as digits as its factorization.

28617893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28617893 is about 5349.5694219255. The cubic root of 28617893 is about 305.8763401685.

The spelling of 28617893 in words is "twenty-eight million, six hundred seventeen thousand, eight hundred ninety-three".