2684723681 has 4 divisors (see below), whose sum is σ = 2687500992. Its totient is φ = 2681946372.

The previous prime is 2684723653. The next prime is 2684723719. The reversal of 2684723681 is 1863274862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2684723681 - 2¹⁰ = 2684722657 is a prime.

It is a super-2 number, since 2×2684723681² = 14415482486644379522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2684723581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387205 + ... + 1389138.

It is an arithmetic number, because the mean of its divisors is an integer number (671875248).

Almost surely, 2^2684723681 is an apocalyptic number.

It is an amenable number.

2684723681 is a deficient number, since it is larger than the sum of its proper divisors (2777311).

2684723681 is an equidigital number, since it uses as much as digits as its factorization.

2684723681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777310.

The product of its digits is 774144, while the sum is 47.

The square root of 2684723681 is about 51814.3192660099. The cubic root of 2684723681 is about 1389.8455189499.

The spelling of 2684723681 in words is "two billion, six hundred eighty-four million, seven hundred twenty-three thousand, six hundred eighty-one".