28821386 has 8 divisors (see below), whose sum is σ = 47162304. Its totient is φ = 13100620.

The previous prime is 28821383. The next prime is 28821407. The reversal of 28821386 is 68312882.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28821383) 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, 655010 + ... + 655053.

It is an arithmetic number, because the mean of its divisors is an integer number (5895288).

Almost surely, 2^28821386 is an apocalyptic number.

28821386 is a deficient number, since it is larger than the sum of its proper divisors (18340918).

28821386 is a wasteful number, since it uses less digits than its factorization.

28821386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310076.

The product of its digits is 36864, while the sum is 38.

The square root of 28821386 is about 5368.5552991471. Note that the first 3 decimals coincide. The cubic root of 28821386 is about 306.5996259144.

The spelling of 28821386 in words is "twenty-eight million, eight hundred twenty-one thousand, three hundred eighty-six".