28021318 has 8 divisors (see below), whose sum is σ = 45265248. Its totient is φ = 12932904.

The previous prime is 28021313. The next prime is 28021319. The reversal of 28021318 is 81312082.

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

It is a junction number, because it is equal to n+sod(n) for n = 28021292 and 28021301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28021313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538846 + ... + 538897.

It is an arithmetic number, because the mean of its divisors is an integer number (5658156).

Almost surely, 2^28021318 is an apocalyptic number.

28021318 is a deficient number, since it is larger than the sum of its proper divisors (17243930).

28021318 is a wasteful number, since it uses less digits than its factorization.

28021318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077758.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28021318 is about 5293.5166005218. The cubic root of 28021318 is about 303.7359419281.

The spelling of 28021318 in words is "twenty-eight million, twenty-one thousand, three hundred eighteen".