28499389 has 2 divisors, whose sum is σ = 28499390. Its totient is φ = 28499388.

The previous prime is 28499381. The next prime is 28499407. The reversal of 28499389 is 98399482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 2059225 = 5142^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 28499389 - 2³ = 28499381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28499381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14249694 + 14249695.

It is an arithmetic number, because the mean of its divisors is an integer number (14249695).

Almost surely, 2^28499389 is an apocalyptic number.

It is an amenable number.

28499389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28499389 is an equidigital number, since it uses as much as digits as its factorization.

28499389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 52.

The square root of 28499389 is about 5338.4819003159. The cubic root of 28499389 is about 305.4535543514.

The spelling of 28499389 in words is "twenty-eight million, four hundred ninety-nine thousand, three hundred eighty-nine".