2643678329 has 4 divisors (see below), whose sum is σ = 2687017380. Its totient is φ = 2600339280.

The previous prime is 2643678311. The next prime is 2643678337. The reversal of 2643678329 is 9238763462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9238763462 = 2 ⋅4619381731.

It can be written as a sum of positive squares in 2 ways, for example, as 1021441600 + 1622236729 = 31960^2 + 40277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643678329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643678229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21669434 + ... + 21669555.

It is an arithmetic number, because the mean of its divisors is an integer number (671754345).

Almost surely, 2^2643678329 is an apocalyptic number.

It is an amenable number.

2643678329 is a deficient number, since it is larger than the sum of its proper divisors (43339051).

2643678329 is an equidigital number, since it uses as much as digits as its factorization.

2643678329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43339050.

The product of its digits is 2612736, while the sum is 50.

The square root of 2643678329 is about 51416.7125456305. The cubic root of 2643678329 is about 1382.7262372624.

The spelling of 2643678329 in words is "two billion, six hundred forty-three million, six hundred seventy-eight thousand, three hundred twenty-nine".