688863880 has 16 divisors (see below), whose sum is σ = 1549943820. Its totient is φ = 275545536.

The previous prime is 688863863. The next prime is 688863971. The reversal of 688863880 is 88368886.

It can be written as a sum of positive squares in 2 ways, for example, as 628304356 + 60559524 = 25066^2 + 7782^2 .

It is an unprimeable number.

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, 8610759 + ... + 8610838.

Almost surely, 2^688863880 is an apocalyptic number.

It is an amenable number.

688863880 is an abundant number, since it is smaller than the sum of its proper divisors (861079940).

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

688863880 is a wasteful number, since it uses less digits than its factorization.

688863880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17221608 (or 17221604 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 55.

The square root of 688863880 is about 26246.2164892390. The cubic root of 688863880 is about 883.1703312220.

The spelling of 688863880 in words is "six hundred eighty-eight million, eight hundred sixty-three thousand, eight hundred eighty".