28217396 has 12 divisors (see below), whose sum is σ = 49432740. Its totient is φ = 14093760.

The previous prime is 28217383. The next prime is 28217401. The reversal of 28217396 is 69371282.

It can be written as a sum of positive squares in 2 ways, for example, as 2856100 + 25361296 = 1690^2 + 5036^2 .

It is a congruent number.

It is an unprimeable number.

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, 1256 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (4119395).

Almost surely, 2^28217396 is an apocalyptic number.

It is an amenable number.

28217396 is a deficient number, since it is larger than the sum of its proper divisors (21215344).

28217396 is a wasteful number, since it uses less digits than its factorization.

28217396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7474 (or 7472 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 28217396 is about 5312.0048945761. The cubic root of 28217396 is about 304.4427556969.

The spelling of 28217396 in words is "twenty-eight million, two hundred seventeen thousand, three hundred ninety-six".