28655993 has 2 divisors, whose sum is σ = 28655994. Its totient is φ = 28655992.

The previous prime is 28655983. The next prime is 28656011. The reversal of 28655993 is 39955682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 7246864 = 4627^2 + 2692^2 .

It is a cyclic number.

It is not a de Polignac number, because 28655993 - 2⁶ = 28655929 is a prime.

It is not a weakly prime, because it can be changed into another prime (28655903) 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, 14327996 + 14327997.

It is an arithmetic number, because the mean of its divisors is an integer number (14327997).

Almost surely, 2^28655993 is an apocalyptic number.

It is an amenable number.

28655993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28655993 is an equidigital number, since it uses as much as digits as its factorization.

28655993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 47.

The square root of 28655993 is about 5353.1292717438. The cubic root of 28655993 is about 306.0120212573.

The spelling of 28655993 in words is "twenty-eight million, six hundred fifty-five thousand, nine hundred ninety-three".