28366445 has 8 divisors (see below), whose sum is σ = 34081560. Its totient is φ = 22665280.

The previous prime is 28366441. The next prime is 28366463. The reversal of 28366445 is 54466382.

It can be written as a sum of positive squares in 4 ways, for example, as 10278436 + 18088009 = 3206^2 + 4253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28366445 - 2² = 28366441 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28366399 and 28366408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28366441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (4260195).

Almost surely, 2^28366445 is an apocalyptic number.

It is an amenable number.

28366445 is a deficient number, since it is larger than the sum of its proper divisors (5715115).

28366445 is an equidigital number, since it uses as much as digits as its factorization.

28366445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6975.

The product of its digits is 138240, while the sum is 38.

The square root of 28366445 is about 5326.0158655415. The cubic root of 28366445 is about 304.9778538072.

The spelling of 28366445 in words is "twenty-eight million, three hundred sixty-six thousand, four hundred forty-five".