687400513 has 4 divisors (see below), whose sum is σ = 700370388. Its totient is φ = 674430640.

The previous prime is 687400507. The next prime is 687400529. The reversal of 687400513 is 315004786.

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 611919169 + 75481344 = 24737^2 + 8688^2 .

It is a cyclic number.

It is not a de Polignac number, because 687400513 - 2²⁹ = 150529601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687400313) 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, 6484858 + ... + 6484963.

It is an arithmetic number, because the mean of its divisors is an integer number (175092597).

Almost surely, 2^687400513 is an apocalyptic number.

It is an amenable number.

687400513 is a deficient number, since it is larger than the sum of its proper divisors (12969875).

687400513 is a wasteful number, since it uses less digits than its factorization.

687400513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12969874.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 687400513 is about 26218.3239929634. The cubic root of 687400513 is about 882.5445092003.

The spelling of 687400513 in words is "six hundred eighty-seven million, four hundred thousand, five hundred thirteen".