28662989 has 2 divisors, whose sum is σ = 28662990. Its totient is φ = 28662988.

The previous prime is 28662973. The next prime is 28663007. The reversal of 28662989 is 98926682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28536964 + 126025 = 5342^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 28662989 - 2⁴ = 28662973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28662929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14331494 + 14331495.

It is an arithmetic number, because the mean of its divisors is an integer number (14331495).

Almost surely, 2^28662989 is an apocalyptic number.

It is an amenable number.

28662989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28662989 is an equidigital number, since it uses as much as digits as its factorization.

28662989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The square root of 28662989 is about 5353.7826814319. The cubic root of 28662989 is about 306.0369222254.

The spelling of 28662989 in words is "twenty-eight million, six hundred sixty-two thousand, nine hundred eighty-nine".