688781304 has 48 divisors (see below), whose sum is σ = 1910956320. Its totient is φ = 223992960.

The previous prime is 688781297. The next prime is 688781339. The reversal of 688781304 is 403187886.

It is a self number, because there is not a number n which added to its sum of digits gives 688781304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113712 + ... + 119615.

It is an arithmetic number, because the mean of its divisors is an integer number (39811590).

Almost surely, 2^688781304 is an apocalyptic number.

It is an amenable number.

688781304 is an abundant number, since it is smaller than the sum of its proper divisors (1222175016).

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

688781304 is a wasteful number, since it uses less digits than its factorization.

688781304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233380 (or 233373 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 688781304 is about 26244.6433391654. The cubic root of 688781304 is about 883.1350404630.

The spelling of 688781304 in words is "six hundred eighty-eight million, seven hundred eighty-one thousand, three hundred four".