688640622 has 16 divisors (see below), whose sum is σ = 1386055632. Its totient is φ = 228084480.

The previous prime is 688640599. The next prime is 688640627. The reversal of 688640622 is 226046886.

688640622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688640627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364579 + ... + 366462.

It is an arithmetic number, because the mean of its divisors is an integer number (86628477).

Almost surely, 2^688640622 is an apocalyptic number.

688640622 is an abundant number, since it is smaller than the sum of its proper divisors (697415010).

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

688640622 is a wasteful number, since it uses less digits than its factorization.

688640622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731203.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 688640622 is about 26241.9629982210. The cubic root of 688640622 is about 883.0749102675.

The spelling of 688640622 in words is "six hundred eighty-eight million, six hundred forty thousand, six hundred twenty-two".