687133697 has 4 divisors (see below), whose sum is σ = 705704916. Its totient is φ = 668562480.

The previous prime is 687133687. The next prime is 687133723. The reversal of 687133697 is 796331786.

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 384512881 + 302620816 = 19609^2 + 17396^2 .

It is a cyclic number.

It is not a de Polignac number, because 687133697 - 2⁶ = 687133633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687133607) 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, 9285554 + ... + 9285627.

It is an arithmetic number, because the mean of its divisors is an integer number (176426229).

Almost surely, 2^687133697 is an apocalyptic number.

It is an amenable number.

687133697 is a deficient number, since it is larger than the sum of its proper divisors (18571219).

687133697 is a wasteful number, since it uses less digits than its factorization.

687133697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18571218.

The product of its digits is 1143072, while the sum is 50.

The square root of 687133697 is about 26213.2351494431. The cubic root of 687133697 is about 882.4303072346.

The spelling of 687133697 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, six hundred ninety-seven".