28198644 has 48 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 8858080.

The previous prime is 28198633. The next prime is 28198649. The reversal of 28198644 is 44689182.

It is a junction number, because it is equal to n+sod(n) for n = 28198596 and 28198605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18877 + ... + 20315.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^28198644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28198644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34836480).

28198644 is an abundant number, since it is smaller than the sum of its proper divisors (41474316).

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

28198644 is a wasteful number, since it uses less digits than its factorization.

28198644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1538 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 28198644 is about 5310.2395426195. The cubic root of 28198644 is about 304.3753011422.

The spelling of 28198644 in words is "twenty-eight million, one hundred ninety-eight thousand, six hundred forty-four".