28366837 has 4 divisors (see below), whose sum is σ = 28386700. Its totient is φ = 28346976.

The previous prime is 28366831. The next prime is 28366883. The reversal of 28366837 is 73866382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8242641 + 20124196 = 2871^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 28366837 - 2¹⁵ = 28334069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28366793 and 28366802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28366831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7608 + ... + 10705.

It is an arithmetic number, because the mean of its divisors is an integer number (7096675).

Almost surely, 2^28366837 is an apocalyptic number.

It is an amenable number.

28366837 is a deficient number, since it is larger than the sum of its proper divisors (19863).

28366837 is a wasteful number, since it uses less digits than its factorization.

28366837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19862.

The product of its digits is 290304, while the sum is 43.

The square root of 28366837 is about 5326.0526659056. The cubic root of 28366837 is about 304.9792586451.

The spelling of 28366837 in words is "twenty-eight million, three hundred sixty-six thousand, eight hundred thirty-seven".