688229623538 has 54 divisors (see below), whose sum is σ = 1082450056653. Its totient is φ = 328174776720.

The previous prime is 688229623337. The next prime is 688229623541. The reversal of 688229623538 is 835326922886.

It can be written as a sum of positive squares in 2 ways, for example, as 565454369089 + 122775254449 = 751967^2 + 350393^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=586613.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4618990688 + ... + 4618990836.

Almost surely, 2^688229623538 is an apocalyptic number.

688229623538 is a deficient number, since it is larger than the sum of its proper divisors (394220433115).

688229623538 is an equidigital number, since it uses as much as digits as its factorization.

688229623538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 309 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 62.

The spelling of 688229623538 in words is "six hundred eighty-eight billion, two hundred twenty-nine million, six hundred twenty-three thousand, five hundred thirty-eight".