28198332 has 36 divisors (see below), whose sum is σ = 72628920. Its totient is φ = 9221472.

The previous prime is 28198321. The next prime is 28198333. The reversal of 28198332 is 23389182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198333) 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, 5482 + ... + 9297.

It is an arithmetic number, because the mean of its divisors is an integer number (2017470).

Almost surely, 2^28198332 is an apocalyptic number.

It is an amenable number.

28198332 is an abundant number, since it is smaller than the sum of its proper divisors (44430588).

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

28198332 is a wasteful number, since it uses less digits than its factorization.

28198332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14842 (or 14837 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 28198332 is about 5310.2101653324. The cubic root of 28198332 is about 304.3741785652.

The spelling of 28198332 in words is "twenty-eight million, one hundred ninety-eight thousand, three hundred thirty-two".