28030321 has 16 divisors (see below), whose sum is σ = 31520448. Its totient is φ = 24710400.

The previous prime is 28030319. The next prime is 28030333. The reversal of 28030321 is 12303082.

It is a happy number.

It is not a de Polignac number, because 28030321 - 2¹ = 28030319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28030421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53541 + ... + 54061.

It is an arithmetic number, because the mean of its divisors is an integer number (1970028).

Almost surely, 2^28030321 is an apocalyptic number.

It is an amenable number.

28030321 is a deficient number, since it is larger than the sum of its proper divisors (3490127).

28030321 is a wasteful number, since it uses less digits than its factorization.

28030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 28030321 is about 5294.3669121057. The cubic root of 28030321 is about 303.7684676630.

The spelling of 28030321 in words is "twenty-eight million, thirty thousand, three hundred twenty-one".