28144564 has 24 divisors (see below), whose sum is σ = 56726208. Its totient is φ = 11968320.

The previous prime is 28144561. The next prime is 28144579. The reversal of 28144564 is 46544182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28144561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (2363592).

Almost surely, 2^28144564 is an apocalyptic number.

It is an amenable number.

28144564 is an abundant number, since it is smaller than the sum of its proper divisors (28581644).

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

28144564 is a wasteful number, since it uses less digits than its factorization.

28144564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815 (or 7813 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 28144564 is about 5305.1450498549. The cubic root of 28144564 is about 304.1805973312.

The spelling of 28144564 in words is "twenty-eight million, one hundred forty-four thousand, five hundred sixty-four".