28974989 has 2 divisors, whose sum is σ = 28974990. Its totient is φ = 28974988.

The previous prime is 28974977. The next prime is 28975081. The reversal of 28974989 is 98947982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25421764 + 3553225 = 5042^2 + 1885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28974989 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (28974949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14487494 + 14487495.

It is an arithmetic number, because the mean of its divisors is an integer number (14487495).

Almost surely, 2^28974989 is an apocalyptic number.

It is an amenable number.

28974989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28974989 is an equidigital number, since it uses as much as digits as its factorization.

28974989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The square root of 28974989 is about 5382.8420931697. The cubic root of 28974989 is about 307.1433333532.

The spelling of 28974989 in words is "twenty-eight million, nine hundred seventy-four thousand, nine hundred eighty-nine".