28461989 has 2 divisors, whose sum is σ = 28461990. Its totient is φ = 28461988.

The previous prime is 28461973. The next prime is 28462003. The reversal of 28461989 is 98916482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 6041764 = 4735^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 28461989 - 2⁴ = 28461973 is a prime.

It is a super-2 number, since 2×28461989² = 1620169635672242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28461959) 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, 14230994 + 14230995.

It is an arithmetic number, because the mean of its divisors is an integer number (14230995).

Almost surely, 2^28461989 is an apocalyptic number.

It is an amenable number.

28461989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28461989 is an equidigital number, since it uses as much as digits as its factorization.

28461989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 28461989 is about 5334.9778818661. The cubic root of 28461989 is about 305.3198793940.

The spelling of 28461989 in words is "twenty-eight million, four hundred sixty-one thousand, nine hundred eighty-nine".