4278638111 has 4 divisors (see below), whose sum is σ = 4667605224. Its totient is φ = 3889671000.

The previous prime is 4278638093. The next prime is 4278638123. The reversal of 4278638111 is 1118368724.

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

It is a cyclic number.

It is not a de Polignac number, because 4278638111 - 2¹⁰ = 4278637087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278638171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194483540 + ... + 194483561.

It is an arithmetic number, because the mean of its divisors is an integer number (1166901306).

Almost surely, 2^4278638111 is an apocalyptic number.

4278638111 is a deficient number, since it is larger than the sum of its proper divisors (388967113).

4278638111 is a wasteful number, since it uses less digits than its factorization.

4278638111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388967112.

The product of its digits is 64512, while the sum is 41.

The square root of 4278638111 is about 65411.2995666651. The cubic root of 4278638111 is about 1623.4360477583.

The spelling of 4278638111 in words is "four billion, two hundred seventy-eight million, six hundred thirty-eight thousand, one hundred eleven".