28204356 has 24 divisors (see below), whose sum is σ = 68080320. Its totient is φ = 9077152.

The previous prime is 28204349. The next prime is 28204357. The reversal of 28204356 is 65340282.

It is not an unprimeable number, because it can be changed into a prime (28204357) 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, 40176 + ... + 40871.

It is an arithmetic number, because the mean of its divisors is an integer number (2836680).

Almost surely, 2^28204356 is an apocalyptic number.

It is an amenable number.

28204356 is an abundant number, since it is smaller than the sum of its proper divisors (39875964).

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

28204356 is a wasteful number, since it uses less digits than its factorization.

28204356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81083 (or 81081 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 28204356 is about 5310.7773442313. Note that the first 3 decimals coincide. The cubic root of 28204356 is about 304.3958514725.

The spelling of 28204356 in words is "twenty-eight million, two hundred four thousand, three hundred fifty-six".