687730687 has 4 divisors (see below), whose sum is σ = 785977936. Its totient is φ = 589483440.

The previous prime is 687730663. The next prime is 687730697. The reversal of 687730687 is 786037786.

It is a happy number.

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

It is not a de Polignac number, because 687730687 - 2⁷ = 687730559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687730607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49123614 + ... + 49123627.

It is an arithmetic number, because the mean of its divisors is an integer number (196494484).

Almost surely, 2^687730687 is an apocalyptic number.

687730687 is a deficient number, since it is larger than the sum of its proper divisors (98247249).

687730687 is an equidigital number, since it uses as much as digits as its factorization.

687730687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98247248.

The product of its (nonzero) digits is 2370816, while the sum is 52.

The square root of 687730687 is about 26224.6198637845. The cubic root of 687730687 is about 882.6857886065.

The spelling of 687730687 in words is "six hundred eighty-seven million, seven hundred thirty thousand, six hundred eighty-seven".