687453217 has 4 divisors (see below), whose sum is σ = 749948976. Its totient is φ = 624957460.

The previous prime is 687453199. The next prime is 687453253. The reversal of 687453217 is 712354786.

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 687453217 - 2¹¹ = 687451169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687453257) 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, 31247863 + ... + 31247884.

It is an arithmetic number, because the mean of its divisors is an integer number (187487244).

Almost surely, 2^687453217 is an apocalyptic number.

It is an amenable number.

687453217 is a deficient number, since it is larger than the sum of its proper divisors (62495759).

687453217 is a wasteful number, since it uses less digits than its factorization.

687453217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62495758.

The product of its digits is 282240, while the sum is 43.

The square root of 687453217 is about 26219.3290722703. The cubic root of 687453217 is about 882.5670639488.

The spelling of 687453217 in words is "six hundred eighty-seven million, four hundred fifty-three thousand, two hundred seventeen".