688722821320 has 32 divisors (see below), whose sum is σ = 1549662580800. Its totient is φ = 275482687168.

The previous prime is 688722821309. The next prime is 688722821351. The reversal of 688722821320 is 23128227886.

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 7 ways as a sum of consecutive naturals, for example, 1768911 + ... + 2122849.

It is an arithmetic number, because the mean of its divisors is an integer number (48426955650).

Almost surely, 2^688722821320 is an apocalyptic number.

It is an amenable number.

688722821320 is an abundant number, since it is smaller than the sum of its proper divisors (860939759480).

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

688722821320 is a wasteful number, since it uses less digits than its factorization.

688722821320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402597 (or 402593 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 688722821320 in words is "six hundred eighty-eight billion, seven hundred twenty-two million, eight hundred twenty-one thousand, three hundred twenty".