28143516 has 24 divisors (see below), whose sum is σ = 66173184. Its totient is φ = 9309040.

The previous prime is 28143487. The next prime is 28143527. The reversal of 28143516 is 61534182.

It is a hoax number, since the sum of its digits (30) 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 7 ways as a sum of consecutive naturals, for example, 7380 + ... + 10523.

It is an arithmetic number, because the mean of its divisors is an integer number (2757216).

Almost surely, 2^28143516 is an apocalyptic number.

It is an amenable number.

28143516 is an abundant number, since it is smaller than the sum of its proper divisors (38029668).

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

28143516 is a wasteful number, since it uses less digits than its factorization.

28143516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18041 (or 18039 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 28143516 is about 5305.0462768952. The cubic root of 28143516 is about 304.1768217622.

Adding to 28143516 its reverse (61534182), we get a palindrome (89677698).

The spelling of 28143516 in words is "twenty-eight million, one hundred forty-three thousand, five hundred sixteen".