688849226258 has 18 divisors (see below), whose sum is σ = 1036206539199. Its totient is φ = 343449810432.

The previous prime is 688849226243. The next prime is 688849226279. The reversal of 688849226258 is 852622948886.

It can be written as a sum of positive squares in 5 ways, for example, as 675958575889 + 12890650369 = 822167^2 + 113537^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=586877.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 597440210 + ... + 597441362.

Almost surely, 2^688849226258 is an apocalyptic number.

688849226258 is a deficient number, since it is larger than the sum of its proper divisors (347357312941).

688849226258 is an frugal number, since it uses more digits than its factorization.

688849226258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326 (or 1664 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 68.

The spelling of 688849226258 in words is "six hundred eighty-eight billion, eight hundred forty-nine million, two hundred twenty-six thousand, two hundred fifty-eight".