687618353 has 4 divisors (see below), whose sum is σ = 694707300. Its totient is φ = 680529408.

The previous prime is 687618313. The next prime is 687618367. The reversal of 687618353 is 353816786.

It is a happy number.

687618353 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 168143089 + 519475264 = 12967^2 + 22792^2 .

It is a cyclic number.

It is not a de Polignac number, because 687618353 - 2²⁶ = 620509489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687618298 and 687618307.

It is not an unprimeable number, because it can be changed into a prime (687618313) 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, 3544328 + ... + 3544521.

It is an arithmetic number, because the mean of its divisors is an integer number (173676825).

Almost surely, 2^687618353 is an apocalyptic number.

It is an amenable number.

687618353 is a deficient number, since it is larger than the sum of its proper divisors (7088947).

687618353 is an equidigital number, since it uses as much as digits as its factorization.

687618353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088946.

The product of its digits is 725760, while the sum is 47.

The square root of 687618353 is about 26222.4780102873. The cubic root of 687618353 is about 882.6377266609.

The spelling of 687618353 in words is "six hundred eighty-seven million, six hundred eighteen thousand, three hundred fifty-three".