688216386 has 64 divisors (see below), whose sum is σ = 1620694656. Its totient is φ = 192076800.

The previous prime is 688216367. The next prime is 688216387. The reversal of 688216386 is 683612886.

It is not an unprimeable number, because it can be changed into a prime (688216387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 703930 + ... + 704906.

It is an arithmetic number, because the mean of its divisors is an integer number (25323354).

Almost surely, 2^688216386 is an apocalyptic number.

688216386 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 688216386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810347328).

688216386 is an abundant number, since it is smaller than the sum of its proper divisors (932478270).

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

688216386 is a wasteful number, since it uses less digits than its factorization.

688216386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827.

The product of its digits is 663552, while the sum is 48.

The square root of 688216386 is about 26233.8785923851. The cubic root of 688216386 is about 882.8935340351.

The spelling of 688216386 in words is "six hundred eighty-eight million, two hundred sixteen thousand, three hundred eighty-six".