28279049 has 4 divisors (see below), whose sum is σ = 29767440. Its totient is φ = 26790660.

The previous prime is 28279039. The next prime is 28279067. The reversal of 28279049 is 94097282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94097282 = 2 ⋅47048641.

It is a cyclic number.

It is not a de Polignac number, because 28279049 - 2²⁰ = 27230473 is a prime.

It is a super-2 number, since 2×28279049² = 1599409224688802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28278997 and 28279015.

It is not an unprimeable number, because it can be changed into a prime (28279019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744167 + ... + 744204.

It is an arithmetic number, because the mean of its divisors is an integer number (7441860).

Almost surely, 2^28279049 is an apocalyptic number.

It is an amenable number.

28279049 is a deficient number, since it is larger than the sum of its proper divisors (1488391).

28279049 is a wasteful number, since it uses less digits than its factorization.

28279049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488390.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 28279049 is about 5317.8049042815. The cubic root of 28279049 is about 304.6643229830.

The spelling of 28279049 in words is "twenty-eight million, two hundred seventy-nine thousand, forty-nine".