28829989 has 2 divisors, whose sum is σ = 28829990. Its totient is φ = 28829988.

The previous prime is 28829953. The next prime is 28830007. The reversal of 28829989 is 98992882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27217089 + 1612900 = 5217^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 28829989 - 2⁹ = 28829477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28829089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14414994 + 14414995.

It is an arithmetic number, because the mean of its divisors is an integer number (14414995).

Almost surely, 2^28829989 is an apocalyptic number.

It is an amenable number.

28829989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28829989 is an equidigital number, since it uses as much as digits as its factorization.

28829989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 55.

The square root of 28829989 is about 5369.3564791323. The cubic root of 28829989 is about 306.6301288909.

The spelling of 28829989 in words is "twenty-eight million, eight hundred twenty-nine thousand, nine hundred eighty-nine".