28230421 has 8 divisors (see below), whose sum is σ = 29937600. Its totient is φ = 26528448.

The previous prime is 28230359. The next prime is 28230443. The reversal of 28230421 is 12403282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28230421 - 2⁹ = 28229909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28230392 and 28230401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28230481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19480 + ... + 20878.

It is an arithmetic number, because the mean of its divisors is an integer number (3742200).

Almost surely, 2^28230421 is an apocalyptic number.

It is an amenable number.

28230421 is a deficient number, since it is larger than the sum of its proper divisors (1707179).

28230421 is a wasteful number, since it uses less digits than its factorization.

28230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28230421 is about 5313.2307497416. The cubic root of 28230421 is about 304.4895915439.

It can be divided in two parts, 282 and 30421, that added together give a palindrome (30703).

The spelling of 28230421 in words is "twenty-eight million, two hundred thirty thousand, four hundred twenty-one".