688248778 has 32 divisors (see below), whose sum is σ = 1207457280. Its totient is φ = 288113280.

The previous prime is 688248767. The next prime is 688248779. The reversal of 688248778 is 877842886.

688248778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (688248779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175398 + ... + 179278.

It is an arithmetic number, because the mean of its divisors is an integer number (37733040).

Almost surely, 2^688248778 is an apocalyptic number.

688248778 is a deficient number, since it is larger than the sum of its proper divisors (519208502).

688248778 is a wasteful number, since it uses less digits than its factorization.

688248778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4182.

The product of its digits is 9633792, while the sum is 58.

The square root of 688248778 is about 26234.4959547539. The cubic root of 688248778 is about 882.9073854144.

The spelling of 688248778 in words is "six hundred eighty-eight million, two hundred forty-eight thousand, seven hundred seventy-eight".