28394547 has 4 divisors (see below), whose sum is σ = 37859400. Its totient is φ = 18929696.

The previous prime is 28394537. The next prime is 28394557. The reversal of 28394547 is 74549382.

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

It is an interprime number because it is at equal distance from previous prime (28394537) and next prime (28394557).

It is a cyclic number.

It is not a de Polignac number, because 28394547 - 2¹⁶ = 28329011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28394499 and 28394508.

It is not an unprimeable number, because it can be changed into a prime (28394507) 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, 4732422 + ... + 4732427.

It is an arithmetic number, because the mean of its divisors is an integer number (9464850).

Almost surely, 2^28394547 is an apocalyptic number.

28394547 is a deficient number, since it is larger than the sum of its proper divisors (9464853).

28394547 is an equidigital number, since it uses as much as digits as its factorization.

28394547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9464852.

The product of its digits is 241920, while the sum is 42.

The square root of 28394547 is about 5328.6533946204. The cubic root of 28394547 is about 305.0785321381.

It can be divided in two parts, 283 and 94547, that added together give a triangular number (94830 = T₄₃₅).

The spelling of 28394547 in words is "twenty-eight million, three hundred ninety-four thousand, five hundred forty-seven".