28243144 has 8 divisors (see below), whose sum is σ = 52955910. Its totient is φ = 14121568.

The previous prime is 28243133. The next prime is 28243151. The reversal of 28243144 is 44134282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 9424900 = 4338^2 + 3070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1765189 + ... + 1765204.

Almost surely, 2^28243144 is an apocalyptic number.

It is an amenable number.

28243144 is a deficient number, since it is larger than the sum of its proper divisors (24712766).

28243144 is a wasteful number, since it uses less digits than its factorization.

28243144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530399 (or 3530395 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 28243144 is about 5314.4279090039. The cubic root of 28243144 is about 304.5353275395.

The spelling of 28243144 in words is "twenty-eight million, two hundred forty-three thousand, one hundred forty-four".