687493706 has 8 divisors (see below), whose sum is σ = 1045367364. Its totient is φ = 339037920.

The previous prime is 687493693. The next prime is 687493717. The reversal of 687493706 is 607394786.

It can be written as a sum of positive squares in 2 ways, for example, as 685968481 + 1525225 = 26191^2 + 1235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×687493706² = 945295191579228872, which contains 22 as substring.

It is a Curzon number.

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, 2354285 + ... + 2354576.

Almost surely, 2^687493706 is an apocalyptic number.

687493706 is a deficient number, since it is larger than the sum of its proper divisors (357873658).

687493706 is a wasteful number, since it uses less digits than its factorization.

687493706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708936.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 687493706 is about 26220.1011821084. The cubic root of 687493706 is about 882.5843904885.

The spelling of 687493706 in words is "six hundred eighty-seven million, four hundred ninety-three thousand, seven hundred six".