28143507206 has 4 divisors (see below), whose sum is σ = 42215260812. Its totient is φ = 14071753602.

The previous prime is 28143507167. The next prime is 28143507211. The reversal of 28143507206 is 60270534182.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28143507206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7035876800 + ... + 7035876803.

It is an arithmetic number, because the mean of its divisors is an integer number (10553815203).

Almost surely, 2^28143507206 is an apocalyptic number.

28143507206 is a deficient number, since it is larger than the sum of its proper divisors (14071753606).

28143507206 is a wasteful number, since it uses less digits than its factorization.

28143507206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14071753605.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 28143507206 in words is "twenty-eight billion, one hundred forty-three million, five hundred seven thousand, two hundred six".