28079489 has 2 divisors, whose sum is σ = 28079490. Its totient is φ = 28079488.

The previous prime is 28079449. The next prime is 28079503. The reversal of 28079489 is 98497082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21003889 + 7075600 = 4583^2 + 2660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28079489 is a prime.

It is a super-2 number, since 2×28079489² = 1576915405002242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28079419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039744 + 14039745.

It is an arithmetic number, because the mean of its divisors is an integer number (14039745).

Almost surely, 2^28079489 is an apocalyptic number.

It is an amenable number.

28079489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28079489 is an equidigital number, since it uses as much as digits as its factorization.

28079489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28079489 is about 5299.0083034470. The cubic root of 28079489 is about 303.9459773868.

The spelling of 28079489 in words is "twenty-eight million, seventy-nine thousand, four hundred eighty-nine".