687513 has 4 divisors (see below), whose sum is σ = 916688. Its totient is φ = 458340.

The previous prime is 687499. The next prime is 687517. The reversal of 687513 is 315786.

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 not a de Polignac number, because 687513 - 2⁵ = 687481 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687517) 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, 114583 + ... + 114588.

It is an arithmetic number, because the mean of its divisors is an integer number (229172).

2⁶⁸⁷⁵¹³ is an apocalyptic number.

It is an amenable number.

687513 is a deficient number, since it is larger than the sum of its proper divisors (229175).

687513 is a wasteful number, since it uses less digits than its factorization.

687513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229174.

The product of its digits is 5040, while the sum is 30.

The square root of 687513 is about 829.1640368468. The cubic root of 687513 is about 88.2592646770.

The spelling of 687513 in words is "six hundred eighty-seven thousand, five hundred thirteen".