688356330 has 64 divisors (see below), whose sum is σ = 1684713600. Its totient is φ = 179953920.

The previous prime is 688356283. The next prime is 688356373. The reversal of 688356330 is 33653886.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 931101 + ... + 931839.

It is an arithmetic number, because the mean of its divisors is an integer number (26323650).

Almost surely, 2^688356330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688356330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842356800).

688356330 is an abundant number, since it is smaller than the sum of its proper divisors (996357270).

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

688356330 is a wasteful number, since it uses less digits than its factorization.

688356330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 688356330 is about 26236.5456948890. The cubic root of 688356330 is about 882.9533733925.

The spelling of 688356330 in words is "six hundred eighty-eight million, three hundred fifty-six thousand, three hundred thirty".