28366427 has 4 divisors (see below), whose sum is σ = 28970016. Its totient is φ = 27762840.

The previous prime is 28366399. The next prime is 28366441. The reversal of 28366427 is 72466382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72466382 = 2 ⋅36233191.

It is a cyclic number.

It is not a de Polignac number, because 28366427 - 2⁶ = 28366363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28366127) 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, 301724 + ... + 301817.

It is an arithmetic number, because the mean of its divisors is an integer number (7242504).

Almost surely, 2^28366427 is an apocalyptic number.

28366427 is a deficient number, since it is larger than the sum of its proper divisors (603589).

28366427 is an equidigital number, since it uses as much as digits as its factorization.

28366427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603588.

The product of its digits is 96768, while the sum is 38.

The square root of 28366427 is about 5326.0141757228. The cubic root of 28366427 is about 304.9777892990.

The spelling of 28366427 in words is "twenty-eight million, three hundred sixty-six thousand, four hundred twenty-seven".