6687123688 has 48 divisors (see below), whose sum is σ = 15088407300. Its totient is φ = 2767080960.

The previous prime is 6687123673. The next prime is 6687123697. The reversal of 6687123688 is 8863217866.

It can be written as a sum of positive squares in 2 ways, for example, as 6109298244 + 577825444 = 78162^2 + 24038^2 .

It is a super-2 number, since 2×6687123688² = 89435246437221442688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282753 + ... + 305488.

Almost surely, 2^6687123688 is an apocalyptic number.

It is an amenable number.

6687123688 is an abundant number, since it is smaller than the sum of its proper divisors (8401283612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687123688 is a wasteful number, since it uses less digits than its factorization.

6687123688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588290 (or 588279 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The square root of 6687123688 is about 81774.8352979081. The cubic root of 6687123688 is about 1883.9951714543.

It can be divided in two parts, 668712 and 3688, that added together give a square (672400 = 820²).

The spelling of 6687123688 in words is "six billion, six hundred eighty-seven million, one hundred twenty-three thousand, six hundred eighty-eight".