2688081845 has 4 divisors (see below), whose sum is σ = 3225698220. Its totient is φ = 2150465472.

The previous prime is 2688081793. The next prime is 2688081911. The reversal of 2688081845 is 5481808862.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1752761956 + 935319889 = 41866^2 + 30583^2 .

It is a cyclic number.

It is not a de Polignac number, because 2688081845 - 2⁸ = 2688081589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2688081793 and 2688081802.

It is a congruent number.

It is an unprimeable number.

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, 268808180 + ... + 268808189.

It is an arithmetic number, because the mean of its divisors is an integer number (806424555).

Almost surely, 2^2688081845 is an apocalyptic number.

It is an amenable number.

2688081845 is a deficient number, since it is larger than the sum of its proper divisors (537616375).

2688081845 is an equidigital number, since it uses as much as digits as its factorization.

2688081845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537616374.

The product of its (nonzero) digits is 983040, while the sum is 50.

The square root of 2688081845 is about 51846.7148911095. The cubic root of 2688081845 is about 1390.4247696864.

The spelling of 2688081845 in words is "two billion, six hundred eighty-eight million, eighty-one thousand, eight hundred forty-five".