687113858 has 4 divisors (see below), whose sum is σ = 1030670790. Its totient is φ = 343556928.

The previous prime is 687113857. The next prime is 687113863. The reversal of 687113858 is 858311786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 670654609 + 16459249 = 25897^2 + 4057^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687113851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171778463 + ... + 171778466.

Almost surely, 2^687113858 is an apocalyptic number.

687113858 is a deficient number, since it is larger than the sum of its proper divisors (343556932).

687113858 is a wasteful number, since it uses less digits than its factorization.

687113858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343556931.

The product of its digits is 322560, while the sum is 47.

The square root of 687113858 is about 26212.8567310013. The cubic root of 687113858 is about 882.4218146111.

The spelling of 687113858 in words is "six hundred eighty-seven million, one hundred thirteen thousand, eight hundred fifty-eight".