28144020 has 48 divisors (see below), whose sum is σ = 79990848. Its totient is φ = 7392000.

The previous prime is 28143971. The next prime is 28144033. The reversal of 28144020 is 2044182.

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 15 ways as a sum of consecutive naturals, for example, 520 + ... + 7520.

It is an arithmetic number, because the mean of its divisors is an integer number (1666476).

Almost surely, 2^28144020 is an apocalyptic number.

28144020 is a gapful number since it is divisible by the number (20) 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 28144020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39995424).

28144020 is an abundant number, since it is smaller than the sum of its proper divisors (51846828).

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

28144020 is a wasteful number, since it uses less digits than its factorization.

28144020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080 (or 7078 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28144020 is about 5305.0937786245. The cubic root of 28144020 is about 304.1786375056.

The spelling of 28144020 in words is "twenty-eight million, one hundred forty-four thousand, twenty".