688216308 has 24 divisors (see below), whose sum is σ = 1729364448. Its totient is φ = 211758816.

The previous prime is 688216307. The next prime is 688216339. The reversal of 688216308 is 803612886.

It is a self number, because there is not a number n which added to its sum of digits gives 688216308.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2205666 + ... + 2205977.

It is an arithmetic number, because the mean of its divisors is an integer number (72056852).

Almost surely, 2^688216308 is an apocalyptic number.

It is an amenable number.

688216308 is an abundant number, since it is smaller than the sum of its proper divisors (1041148140).

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

688216308 is a wasteful number, since it uses less digits than its factorization.

688216308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411663 (or 4411661 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 688216308 is about 26233.8771057577. The cubic root of 688216308 is about 882.8935006804.

The spelling of 688216308 in words is "six hundred eighty-eight million, two hundred sixteen thousand, three hundred eight".