688941812 has 12 divisors (see below), whose sum is σ = 1298390436. Its totient is φ = 317973120.

The previous prime is 688941811. The next prime is 688941833. The reversal of 688941812 is 218149886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 131698576 + 557243236 = 11476^2 + 23606^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688941811) by changing a digit.

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, 6624389 + ... + 6624492.

It is an arithmetic number, because the mean of its divisors is an integer number (108199203).

Almost surely, 2^688941812 is an apocalyptic number.

It is an amenable number.

688941812 is a deficient number, since it is larger than the sum of its proper divisors (609448624).

688941812 is a wasteful number, since it uses less digits than its factorization.

688941812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248898 (or 13248896 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 688941812 is about 26247.7010802851. The cubic root of 688941812 is about 883.2036346737.

The spelling of 688941812 in words is "six hundred eighty-eight million, nine hundred forty-one thousand, eight hundred twelve".