687686814 has 16 divisors (see below), whose sum is σ = 1528193040. Its totient is φ = 229228920.

The previous prime is 687686807. The next prime is 687686849. The reversal of 687686814 is 418686786.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12734941 = 687686814 / (6 + 8 + 7 + 6 + 8 + 6 + 8 + 1 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6367417 + ... + 6367524.

It is an arithmetic number, because the mean of its divisors is an integer number (95512065).

Almost surely, 2^687686814 is an apocalyptic number.

687686814 is an abundant number, since it is smaller than the sum of its proper divisors (840506226).

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

687686814 is a wasteful number, since it uses less digits than its factorization.

687686814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12734952 (or 12734946 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 687686814 is about 26223.7833654871. The cubic root of 687686814 is about 882.6670182274.

The spelling of 687686814 in words is "six hundred eighty-seven million, six hundred eighty-six thousand, eight hundred fourteen".