28353989 has 2 divisors, whose sum is σ = 28353990. Its totient is φ = 28353988.

The previous prime is 28353979. The next prime is 28354021. The reversal of 28353989 is 98935382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19651489 + 8702500 = 4433^2 + 2950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28353989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28353979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14176994 + 14176995.

It is an arithmetic number, because the mean of its divisors is an integer number (14176995).

Almost surely, 2^28353989 is an apocalyptic number.

It is an amenable number.

28353989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28353989 is an equidigital number, since it uses as much as digits as its factorization.

28353989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The square root of 28353989 is about 5324.8463827607. The cubic root of 28353989 is about 304.9332076262.

The spelling of 28353989 in words is "twenty-eight million, three hundred fifty-three thousand, nine hundred eighty-nine".