28018849 has 4 divisors (see below), whose sum is σ = 28031680. Its totient is φ = 28006020.

The previous prime is 28018799. The next prime is 28018871. The reversal of 28018849 is 94881082.

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: 94881082 = 2 ⋅47440541.

It is a cyclic number.

It is not a de Polignac number, because 28018849 - 2¹³ = 28010657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28018649) 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, 2229 + ... + 7810.

It is an arithmetic number, because the mean of its divisors is an integer number (7007920).

Almost surely, 2^28018849 is an apocalyptic number.

It is an amenable number.

28018849 is a deficient number, since it is larger than the sum of its proper divisors (12831).

28018849 is a wasteful number, since it uses less digits than its factorization.

28018849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 28018849 is about 5293.2833855746. The cubic root of 28018849 is about 303.7270207909.

The spelling of 28018849 in words is "twenty-eight million, eighteen thousand, eight hundred forty-nine".