687782313 has 8 divisors (see below), whose sum is σ = 1018936800. Its totient is φ = 458521524.

The previous prime is 687782287. The next prime is 687782341. The reversal of 687782313 is 313287786.

It is not a de Polignac number, because 687782313 - 2⁵ = 687782281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687782353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12736683 + ... + 12736736.

It is an arithmetic number, because the mean of its divisors is an integer number (127367100).

Almost surely, 2^687782313 is an apocalyptic number.

It is an amenable number.

687782313 is a deficient number, since it is larger than the sum of its proper divisors (331154487).

687782313 is a wasteful number, since it uses less digits than its factorization.

687782313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25473428 (or 25473422 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 687782313 is about 26225.6041493804. The cubic root of 687782313 is about 882.7078749634.

The spelling of 687782313 in words is "six hundred eighty-seven million, seven hundred eighty-two thousand, three hundred thirteen".