28219836 has 12 divisors (see below), whose sum is σ = 65846312. Its totient is φ = 9406608.

The previous prime is 28219831. The next prime is 28219843. The reversal of 28219836 is 63891282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 28219794 and 28219803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28219831) 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, 1175815 + ... + 1175838.

Almost surely, 2^28219836 is an apocalyptic number.

It is an amenable number.

28219836 is an abundant number, since it is smaller than the sum of its proper divisors (37626476).

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

28219836 is a wasteful number, since it uses less digits than its factorization.

28219836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351660 (or 2351658 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 28219836 is about 5312.2345580744. The cubic root of 28219836 is about 304.4515306493.

The spelling of 28219836 in words is "twenty-eight million, two hundred nineteen thousand, eight hundred thirty-six".