28644028 has 36 divisors (see below), whose sum is σ = 59323320. Its totient is φ = 12063072.

The previous prime is 28644019. The next prime is 28644037. The reversal of 28644028 is 82044682.

It is an interprime number because it is at equal distance from previous prime (28644019) and next prime (28644037).

It is a junction number, because it is equal to n+sod(n) for n = 28643984 and 28644002.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10326 + ... + 12802.

It is an arithmetic number, because the mean of its divisors is an integer number (1647870).

Almost surely, 2^28644028 is an apocalyptic number.

28644028 is a gapful number since it is divisible by the number (28) 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 28644028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29661660).

28644028 is an abundant number, since it is smaller than the sum of its proper divisors (30679292).

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

28644028 is a wasteful number, since it uses less digits than its factorization.

28644028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554 (or 2545 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28644028 is about 5352.0115844419. The cubic root of 28644028 is about 305.9694246580.

The spelling of 28644028 in words is "twenty-eight million, six hundred forty-four thousand, twenty-eight".