687681712 has 10 divisors (see below), whose sum is σ = 1332383348. Its totient is φ = 343840848.

The previous prime is 687681707. The next prime is 687681721. The reversal of 687681712 is 217186786.

It is a super-2 number, since 2×687681712² = 945812274038501888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21490038 + ... + 21490069.

Almost surely, 2^687681712 is an apocalyptic number.

It is an amenable number.

687681712 is a deficient number, since it is larger than the sum of its proper divisors (644701636).

687681712 is a wasteful number, since it uses less digits than its factorization.

687681712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42980115 (or 42980109 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 687681712 is about 26223.6860871999. The cubic root of 687681712 is about 882.6648353644.

It can be divided in two parts, 6876 and 81712, that added together give a palindrome (88588).

The spelling of 687681712 in words is "six hundred eighty-seven million, six hundred eighty-one thousand, seven hundred twelve".