28204218 has 24 divisors (see below), whose sum is σ = 69839328. Its totient is φ = 8058312.

The previous prime is 28204217. The next prime is 28204219. The reversal of 28204218 is 81240282.

It is an interprime number because it is at equal distance from previous prime (28204217) and next prime (28204219).

It is a junction number, because it is equal to n+sod(n) for n = 28204191 and 28204200.

It is not an unprimeable number, because it can be changed into a prime (28204217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111796 + ... + 112047.

It is an arithmetic number, because the mean of its divisors is an integer number (2909972).

Almost surely, 2^28204218 is an apocalyptic number.

28204218 is an abundant number, since it is smaller than the sum of its proper divisors (41635110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28204218 is a wasteful number, since it uses less digits than its factorization.

28204218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223858 (or 223855 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28204218 is about 5310.7643517671. The cubic root of 28204218 is about 304.3953550161.

The spelling of 28204218 in words is "twenty-eight million, two hundred four thousand, two hundred eighteen".