688813340 has 48 divisors (see below), whose sum is σ = 1462944672. Its totient is φ = 272414976.

The previous prime is 688813337. The next prime is 688813373. The reversal of 688813340 is 43318886.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784982 + ... + 785858.

It is an arithmetic number, because the mean of its divisors is an integer number (30478014).

Almost surely, 2^688813340 is an apocalyptic number.

It is an amenable number.

688813340 is an abundant number, since it is smaller than the sum of its proper divisors (774131332).

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

688813340 is a wasteful number, since it uses less digits than its factorization.

688813340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 688813340 is about 26245.2536661393. The cubic root of 688813340 is about 883.1487321216.

The spelling of 688813340 in words is "six hundred eighty-eight million, eight hundred thirteen thousand, three hundred forty".