2643678309 has 16 divisors (see below), whose sum is σ = 3648078720. Its totient is φ = 1700919360.

The previous prime is 2643678299. The next prime is 2643678311. The reversal of 2643678309 is 9038763462.

2643678309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2643678309 - 2⁴ = 2643678293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643678409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241464 + ... + 252174.

It is an arithmetic number, because the mean of its divisors is an integer number (228004920).

Almost surely, 2^2643678309 is an apocalyptic number.

2643678309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2643678309 is a deficient number, since it is larger than the sum of its proper divisors (1004400411).

2643678309 is a wasteful number, since it uses less digits than its factorization.

2643678309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13580.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The square root of 2643678309 is about 51416.7123511412. The cubic root of 2643678309 is about 1382.7262337755.

The spelling of 2643678309 in words is "two billion, six hundred forty-three million, six hundred seventy-eight thousand, three hundred nine".