688194077828 has 24 divisors (see below), whose sum is σ = 1207734912384. Its totient is φ = 343127685600.

The previous prime is 688194077821. The next prime is 688194077833. The reversal of 688194077828 is 828770491886.

It is a super-2 number, since 2×688194077828² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688194077821) 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 7 ways as a sum of consecutive naturals, for example, 3761963 + ... + 3940653.

It is an arithmetic number, because the mean of its divisors is an integer number (50322288016).

Almost surely, 2^688194077828 is an apocalyptic number.

It is an amenable number.

688194077828 is a deficient number, since it is larger than the sum of its proper divisors (519540834556).

688194077828 is a wasteful number, since it uses less digits than its factorization.

688194077828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181403 (or 181401 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 68.

The spelling of 688194077828 in words is "six hundred eighty-eight billion, one hundred ninety-four million, seventy-seven thousand, eight hundred twenty-eight".