687668658 has 8 divisors (see below), whose sum is σ = 1375337328. Its totient is φ = 229222884.

The previous prime is 687668621. The next prime is 687668669. The reversal of 687668658 is 856866786.

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

687668658 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57305716 + ... + 57305727.

It is an arithmetic number, because the mean of its divisors is an integer number (171917166).

Almost surely, 2^687668658 is an apocalyptic number.

687668658 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

687668658 is a wasteful number, since it uses less digits than its factorization.

687668658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114611448.

The product of its digits is 23224320, while the sum is 60.

The square root of 687668658 is about 26223.4371888965. The cubic root of 687668658 is about 882.6592502323.

The spelling of 687668658 in words is "six hundred eighty-seven million, six hundred sixty-eight thousand, six hundred fifty-eight".