28143898 has 4 divisors (see below), whose sum is σ = 42215850. Its totient is φ = 14071948.

The previous prime is 28143827. The next prime is 28143911. The reversal of 28143898 is 89834182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26286129 + 1857769 = 5127^2 + 1363^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7035973 + ... + 7035976.

Almost surely, 2^28143898 is an apocalyptic number.

28143898 is a deficient number, since it is larger than the sum of its proper divisors (14071952).

28143898 is a wasteful number, since it uses less digits than its factorization.

28143898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14071951.

The product of its digits is 110592, while the sum is 43.

The square root of 28143898 is about 5305.0822802290. The cubic root of 28143898 is about 304.1781979824.

The spelling of 28143898 in words is "twenty-eight million, one hundred forty-three thousand, eight hundred ninety-eight".