688746706 has 8 divisors (see below), whose sum is σ = 1034579340. Its totient is φ = 343886928.

The previous prime is 688746697. The next prime is 688746739. The reversal of 688746706 is 607647886.

It can be written as a sum of positive squares in 2 ways, for example, as 665175681 + 23571025 = 25791^2 + 4855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 241441 + ... + 244276.

Almost surely, 2^688746706 is an apocalyptic number.

688746706 is a deficient number, since it is larger than the sum of its proper divisors (345832634).

688746706 is a wasteful number, since it uses less digits than its factorization.

688746706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486428.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The square root of 688746706 is about 26243.9841868570. The cubic root of 688746706 is about 883.1202533709.

The spelling of 688746706 in words is "six hundred eighty-eight million, seven hundred forty-six thousand, seven hundred six".