4278643809 has 8 divisors (see below), whose sum is σ = 6223481952. Its totient is φ = 2593117440.

The previous prime is 4278643799. The next prime is 4278643813. The reversal of 4278643809 is 9083468724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4278643809 - 2⁹ = 4278643297 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4278643009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64827904 + ... + 64827969.

It is an arithmetic number, because the mean of its divisors is an integer number (777935244).

Almost surely, 2^4278643809 is an apocalyptic number.

It is an amenable number.

4278643809 is a deficient number, since it is larger than the sum of its proper divisors (1944838143).

4278643809 is a wasteful number, since it uses less digits than its factorization.

4278643809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129655887.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The square root of 4278643809 is about 65411.3431218164. The cubic root of 4278643809 is about 1623.4367684187.

The spelling of 4278643809 in words is "four billion, two hundred seventy-eight million, six hundred forty-three thousand, eight hundred nine".