28472489 has 2 divisors, whose sum is σ = 28472490. Its totient is φ = 28472488.

The previous prime is 28472473. The next prime is 28472533. The reversal of 28472489 is 98427482.

It is an a-pointer prime, because the next prime (28472533) can be obtained adding 28472489 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25928464 + 2544025 = 5092^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 28472489 - 2⁴ = 28472473 is a prime.

It is not a weakly prime, because it can be changed into another prime (28472419) 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, 14236244 + 14236245.

It is an arithmetic number, because the mean of its divisors is an integer number (14236245).

Almost surely, 2^28472489 is an apocalyptic number.

It is an amenable number.

28472489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28472489 is an equidigital number, since it uses as much as digits as its factorization.

28472489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The square root of 28472489 is about 5335.9618626823. The cubic root of 28472489 is about 305.3574202769.

The spelling of 28472489 in words is "twenty-eight million, four hundred seventy-two thousand, four hundred eighty-nine".