688216306 has 12 divisors (see below), whose sum is σ = 1066702446. Its totient is φ = 333006960.

The previous prime is 688216301. The next prime is 688216307. The reversal of 688216306 is 603612886.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 65464281 = 24955^2 + 8091^2 .

It is not an unprimeable number, because it can be changed into a prime (688216301) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 177115 + ... + 180958.

Almost surely, 2^688216306 is an apocalyptic number.

688216306 is a deficient number, since it is larger than the sum of its proper divisors (378486140).

688216306 is a wasteful number, since it uses less digits than its factorization.

688216306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358137 (or 358106 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 688216306 is about 26233.8770676391. The cubic root of 688216306 is about 882.8934998251.

The spelling of 688216306 in words is "six hundred eighty-eight million, two hundred sixteen thousand, three hundred six".