687255713 has 4 divisors (see below), whose sum is σ = 703238448. Its totient is φ = 671272980.

The previous prime is 687255697. The next prime is 687255731. The reversal of 687255713 is 317552786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687255713 - 2⁴ = 687255697 is a prime.

It is a super-2 number, since 2×687255713² = 944640830102276738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687255743) 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, 7991303 + ... + 7991388.

It is an arithmetic number, because the mean of its divisors is an integer number (175809612).

Almost surely, 2^687255713 is an apocalyptic number.

It is an amenable number.

687255713 is a deficient number, since it is larger than the sum of its proper divisors (15982735).

687255713 is a wasteful number, since it uses less digits than its factorization.

687255713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15982734.

The product of its digits is 352800, while the sum is 44.

The square root of 687255713 is about 26215.5624200588. The cubic root of 687255713 is about 882.4825359078.

The spelling of 687255713 in words is "six hundred eighty-seven million, two hundred fifty-five thousand, seven hundred thirteen".