687648497 has 4 divisors (see below), whose sum is σ = 694324800. Its totient is φ = 680972196.

The previous prime is 687648431. The next prime is 687648517. The reversal of 687648497 is 794846786.

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 687648497 - 2¹² = 687644401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687648427) 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, 3337997 + ... + 3338202.

It is an arithmetic number, because the mean of its divisors is an integer number (173581200).

Almost surely, 2^687648497 is an apocalyptic number.

It is an amenable number.

687648497 is a deficient number, since it is larger than the sum of its proper divisors (6676303).

687648497 is a wasteful number, since it uses less digits than its factorization.

687648497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6676302.

The product of its digits is 16257024, while the sum is 59.

The square root of 687648497 is about 26223.0527780425. The cubic root of 687648497 is about 882.6506242432.

The spelling of 687648497 in words is "six hundred eighty-seven million, six hundred forty-eight thousand, four hundred ninety-seven".