28165144 has 64 divisors (see below), whose sum is σ = 64396800. Its totient is φ = 11280384.

The previous prime is 28165117. The next prime is 28165147. The reversal of 28165144 is 44156182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109464 + ... + 109720.

It is an arithmetic number, because the mean of its divisors is an integer number (1006200).

Almost surely, 2^28165144 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 28165144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32198400).

28165144 is an abundant number, since it is smaller than the sum of its proper divisors (36231656).

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

28165144 is a wasteful number, since it uses less digits than its factorization.

28165144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 388 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 28165144 is about 5307.0843219229. The cubic root of 28165144 is about 304.2547207212.

The spelling of 28165144 in words is "twenty-eight million, one hundred sixty-five thousand, one hundred forty-four".