28144004 has 12 divisors (see below), whose sum is σ = 56288064. Its totient is φ = 12061704.

The previous prime is 28143971. The next prime is 28144033. The reversal of 28144004 is 40044182.

28144004 is an admirable number.

It is a super-2 number, since 2×28144004² = 1584169922304032, which contains 22 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502544 + ... + 502599.

It is an arithmetic number, because the mean of its divisors is an integer number (4690672).

Almost surely, 2^28144004 is an apocalyptic number.

It is an amenable number.

28144004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28144004 is a wasteful number, since it uses less digits than its factorization.

28144004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005154 (or 1005152 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 28144004 is about 5305.0922706396. The cubic root of 28144004 is about 304.1785798632.

Adding to 28144004 its reverse (40044182), we get a palindrome (68188186).

The spelling of 28144004 in words is "twenty-eight million, one hundred forty-four thousand, four".