688348740 has 96 divisors (see below), whose sum is σ = 1987824384. Its totient is φ = 177845760.

The previous prime is 688348733. The next prime is 688348753. The reversal of 688348740 is 47843886.

It is a self number, because there is not a number n which added to its sum of digits gives 688348740.

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 31 ways as a sum of consecutive naturals, for example, 689922 + ... + 690918.

It is an arithmetic number, because the mean of its divisors is an integer number (20706504).

Almost surely, 2^688348740 is an apocalyptic number.

688348740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688348740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993912192).

688348740 is an abundant number, since it is smaller than the sum of its proper divisors (1299475644).

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

688348740 is a wasteful number, since it uses less digits than its factorization.

688348740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The square root of 688348740 is about 26236.4010489244. The cubic root of 688348740 is about 882.9501281543.

The spelling of 688348740 in words is "six hundred eighty-eight million, three hundred forty-eight thousand, seven hundred forty".