28224001 has 4 divisors (see below), whose sum is σ = 30395092. Its totient is φ = 26052912.

The previous prime is 28223941. The next prime is 28224011. The reversal of 28224001 is 10042282.

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 10246401 + 17977600 = 3201^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 28224001 - 2¹³ = 28215809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28224001.

It is not an unprimeable number, because it can be changed into a prime (28224011) 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, 1085526 + ... + 1085551.

It is an arithmetic number, because the mean of its divisors is an integer number (7598773).

Almost surely, 2^28224001 is an apocalyptic number.

It is an amenable number.

28224001 is a deficient number, since it is larger than the sum of its proper divisors (2171091).

28224001 is a wasteful number, since it uses less digits than its factorization.

28224001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171090.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 28224001 is about 5312.6265631983. The cubic root of 28224001 is about 304.4665080366.

Adding to 28224001 its reverse (10042282), we get a palindrome (38266283).

The spelling of 28224001 in words is "twenty-eight million, two hundred twenty-four thousand, one".