688090266 has 24 divisors (see below), whose sum is σ = 1578560724. Its totient is φ = 215871360.

The previous prime is 688090219. The next prime is 688090289. The reversal of 688090266 is 662090886.

It can be written as a sum of positive squares in 2 ways, for example, as 569824641 + 118265625 = 23871^2 + 10875^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1124025 + ... + 1124636.

Almost surely, 2^688090266 is an apocalyptic number.

688090266 is an abundant number, since it is smaller than the sum of its proper divisors (890470458).

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

688090266 is a wasteful number, since it uses less digits than its factorization.

688090266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248686 (or 2248683 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 688090266 is about 26231.4747202669. The cubic root of 688090266 is about 882.8395988012.

The spelling of 688090266 in words is "six hundred eighty-eight million, ninety thousand, two hundred sixty-six".