2808653840 has 40 divisors (see below), whose sum is σ = 6538342680. Its totient is φ = 1122046976.

The previous prime is 2808653801. The next prime is 2808653863. The reversal of 2808653840 is 483568082.

It can be written as a sum of positive squares in 4 ways, for example, as 1392185344 + 1416468496 = 37312^2 + 37636^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2808653791 and 2808653800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43022 + ... + 86418.

It is an arithmetic number, because the mean of its divisors is an integer number (163458567).

Almost surely, 2^2808653840 is an apocalyptic number.

2808653840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2808653840 is an abundant number, since it is smaller than the sum of its proper divisors (3729688840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2808653840 is a wasteful number, since it uses less digits than its factorization.

2808653840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44219 (or 44213 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 2808653840 is about 52996.7342390076. The cubic root of 2808653840 is about 1410.9103053220.

The spelling of 2808653840 in words is "two billion, eight hundred eight million, six hundred fifty-three thousand, eight hundred forty".