28266973 has 20 divisors (see below), whose sum is σ = 33690428. Its totient is φ = 23708160.

The previous prime is 28266961. The next prime is 28266991. The reversal of 28266973 is 37966282.

It can be written as a sum of positive squares in 2 ways, for example, as 3286969 + 24980004 = 1813^2 + 4998^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28266973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28266913) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 146365 + ... + 146557.

Almost surely, 2^28266973 is an apocalyptic number.

It is an amenable number.

28266973 is a deficient number, since it is larger than the sum of its proper divisors (5423455).

28266973 is an frugal number, since it uses more digits than its factorization.

28266973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 261 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 28266973 is about 5316.6693521414. The cubic root of 28266973 is about 304.6209498815.

The spelling of 28266973 in words is "twenty-eight million, two hundred sixty-six thousand, nine hundred seventy-three".