688828620 has 48 divisors (see below), whose sum is σ = 1951971840. Its totient is φ = 181473216.

The previous prime is 688828607. The next prime is 688828631. The reversal of 688828620 is 26828886.

It is a super-2 number, since 2×688828620² = 948969735462208800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 688828620.

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 15 ways as a sum of consecutive naturals, for example, 64180 + ... + 74139.

It is an arithmetic number, because the mean of its divisors is an integer number (40666080).

Almost surely, 2^688828620 is an apocalyptic number.

688828620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688828620 is an abundant number, since it is smaller than the sum of its proper divisors (1263143220).

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

688828620 is a wasteful number, since it uses less digits than its factorization.

688828620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138414 (or 138412 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The square root of 688828620 is about 26245.5447647786. The cubic root of 688828620 is about 883.1552623924.

The spelling of 688828620 in words is "six hundred eighty-eight million, eight hundred twenty-eight thousand, six hundred twenty".