687717398 has 8 divisors (see below), whose sum is σ = 1033157808. Its totient is φ = 343331464.

The previous prime is 687717377. The next prime is 687717461. The reversal of 687717398 is 893717786.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261986 + ... + 264597.

It is an arithmetic number, because the mean of its divisors is an integer number (129144726).

Almost surely, 2^687717398 is an apocalyptic number.

687717398 is a deficient number, since it is larger than the sum of its proper divisors (345440410).

687717398 is a wasteful number, since it uses less digits than its factorization.

687717398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527238.

The product of its digits is 3556224, while the sum is 56.

The square root of 687717398 is about 26224.3664937783. The cubic root of 687717398 is about 882.6801031993.

The spelling of 687717398 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, three hundred ninety-eight".