28553989 has 2 divisors, whose sum is σ = 28553990. Its totient is φ = 28553988.

The previous prime is 28553981. The next prime is 28554041. The reversal of 28553989 is 98935582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 7924225 = 4542^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 28553989 - 2³ = 28553981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28553981) 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, 14276994 + 14276995.

It is an arithmetic number, because the mean of its divisors is an integer number (14276995).

Almost surely, 2^28553989 is an apocalyptic number.

It is an amenable number.

28553989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28553989 is an equidigital number, since it uses as much as digits as its factorization.

28553989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 49.

The square root of 28553989 is about 5343.5932667073. The cubic root of 28553989 is about 305.6484956629.

The spelling of 28553989 in words is "twenty-eight million, five hundred fifty-three thousand, nine hundred eighty-nine".