28203912 has 96 divisors (see below), whose sum is σ = 84240000. Its totient is φ = 8453760.

The previous prime is 28203883. The next prime is 28203919. The reversal of 28203912 is 21930282.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28203919) 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 23 ways as a sum of consecutive naturals, for example, 117889 + ... + 118127.

It is an arithmetic number, because the mean of its divisors is an integer number (877500).

Almost surely, 2^28203912 is an apocalyptic number.

28203912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28203912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42120000).

28203912 is an abundant number, since it is smaller than the sum of its proper divisors (56036088).

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

28203912 is a wasteful number, since it uses less digits than its factorization.

28203912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28203912 is about 5310.7355422766. The cubic root of 28203912 is about 304.3942541723.

The spelling of 28203912 in words is "twenty-eight million, two hundred three thousand, nine hundred twelve".