2644318678 has 4 divisors (see below), whose sum is σ = 3966478020. Its totient is φ = 1322159338.

The previous prime is 2644318661. The next prime is 2644318679. The reversal of 2644318678 is 8768134462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8768134462 = 2 ⋅4384067231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644318679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661079668 + ... + 661079671.

It is an arithmetic number, because the mean of its divisors is an integer number (991619505).

Almost surely, 2^2644318678 is an apocalyptic number.

2644318678 is a deficient number, since it is larger than the sum of its proper divisors (1322159342).

2644318678 is a wasteful number, since it uses less digits than its factorization.

2644318678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322159341.

The product of its digits is 1548288, while the sum is 49.

The square root of 2644318678 is about 51422.9392197684. The cubic root of 2644318678 is about 1382.8378690841.

The spelling of 2644318678 in words is "two billion, six hundred forty-four million, three hundred eighteen thousand, six hundred seventy-eight".