687674357 has 4 divisors (see below), whose sum is σ = 694483116. Its totient is φ = 680865600.

The previous prime is 687674347. The next prime is 687674359. The reversal of 687674357 is 753476786.

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 577969681 + 109704676 = 24041^2 + 10474^2 .

It is a cyclic number.

It is not a de Polignac number, because 687674357 - 2²⁶ = 620565493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687674299 and 687674308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687674359) 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, 3404228 + ... + 3404429.

It is an arithmetic number, because the mean of its divisors is an integer number (173620779).

Almost surely, 2^687674357 is an apocalyptic number.

It is an amenable number.

687674357 is a deficient number, since it is larger than the sum of its proper divisors (6808759).

687674357 is a wasteful number, since it uses less digits than its factorization.

687674357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808758.

The product of its digits is 5927040, while the sum is 53.

The square root of 687674357 is about 26223.5458510095. The cubic root of 687674357 is about 882.6616885486.

The spelling of 687674357 in words is "six hundred eighty-seven million, six hundred seventy-four thousand, three hundred fifty-seven".