2678981647 has 4 divisors (see below), whose sum is σ = 2680266160. Its totient is φ = 2677697136.

The previous prime is 2678981629. The next prime is 2678981651. The reversal of 2678981647 is 7461898762.

2678981647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2678981647 - 2¹¹ = 2678979599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2678981591 and 2678981600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678981677) 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, 639123 + ... + 643300.

It is an arithmetic number, because the mean of its divisors is an integer number (670066540).

Almost surely, 2^2678981647 is an apocalyptic number.

2678981647 is a deficient number, since it is larger than the sum of its proper divisors (1284513).

2678981647 is a wasteful number, since it uses less digits than its factorization.

2678981647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284512.

The product of its digits is 8128512, while the sum is 58.

The square root of 2678981647 is about 51758.8798854844. The cubic root of 2678981647 is about 1388.8539536488.

The spelling of 2678981647 in words is "two billion, six hundred seventy-eight million, nine hundred eighty-one thousand, six hundred forty-seven".