687669386 has 8 divisors (see below), whose sum is σ = 1032221280. Its totient is φ = 343595628.

The previous prime is 687669377. The next prime is 687669391. The reversal of 687669386 is 683966786.

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

It is a super-3 number, since 3×687669386³ (a number of 27 digits) contains 333 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, 115916 + ... + 121703.

It is an arithmetic number, because the mean of its divisors is an integer number (129027660).

Almost surely, 2^687669386 is an apocalyptic number.

687669386 is a deficient number, since it is larger than the sum of its proper divisors (344551894).

687669386 is a wasteful number, since it uses less digits than its factorization.

687669386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239068.

The product of its digits is 15676416, while the sum is 59.

The square root of 687669386 is about 26223.4510696056. The cubic root of 687669386 is about 882.6595617077.

The spelling of 687669386 in words is "six hundred eighty-seven million, six hundred sixty-nine thousand, three hundred eighty-six".