688943620 has 12 divisors (see below), whose sum is σ = 1446781644. Its totient is φ = 275577440.

The previous prime is 688943603. The next prime is 688943627. The reversal of 688943620 is 26349886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 332187076 + 356756544 = 18226^2 + 18888^2 .

It is not an unprimeable number, because it can be changed into a prime (688943627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17223571 + ... + 17223610.

It is an arithmetic number, because the mean of its divisors is an integer number (120565137).

Almost surely, 2^688943620 is an apocalyptic number.

It is an amenable number.

688943620 is an abundant number, since it is smaller than the sum of its proper divisors (757838024).

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

688943620 is a wasteful number, since it uses less digits than its factorization.

688943620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34447190 (or 34447188 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 688943620 is about 26247.7355213740. The cubic root of 688943620 is about 883.2044072744.

The spelling of 688943620 in words is "six hundred eighty-eight million, nine hundred forty-three thousand, six hundred twenty".