687666472 has 16 divisors (see below), whose sum is σ = 1300786740. Its totient is φ = 340790016.

The previous prime is 687666461. The next prime is 687666491. The reversal of 687666472 is 274666786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 677769156 + 9897316 = 26034^2 + 3146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379443 + ... + 381250.

Almost surely, 2^687666472 is an apocalyptic number.

It is an amenable number.

687666472 is a deficient number, since it is larger than the sum of its proper divisors (613120268).

687666472 is a wasteful number, since it uses less digits than its factorization.

687666472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760812 (or 760808 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 52.

The square root of 687666472 is about 26223.3955085912. The cubic root of 687666472 is about 882.6583149489.

The spelling of 687666472 in words is "six hundred eighty-seven million, six hundred sixty-six thousand, four hundred seventy-two".