28144145 has 16 divisors (see below), whose sum is σ = 35016960. Its totient is φ = 21700224.

The previous prime is 28144139. The next prime is 28144147. The reversal of 28144145 is 54144182.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28144145 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28144147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16157 + ... + 17813.

It is an arithmetic number, because the mean of its divisors is an integer number (2188560).

Almost surely, 2^28144145 is an apocalyptic number.

It is an amenable number.

28144145 is a deficient number, since it is larger than the sum of its proper divisors (6872815).

28144145 is a wasteful number, since it uses less digits than its factorization.

28144145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784.

The product of its digits is 5120, while the sum is 29.

The square root of 28144145 is about 5305.1055597415. The cubic root of 28144145 is about 304.1790878354.

The spelling of 28144145 in words is "twenty-eight million, one hundred forty-four thousand, one hundred forty-five".