687852013 has 4 divisors (see below), whose sum is σ = 692072128. Its totient is φ = 683631900.

The previous prime is 687852001. The next prime is 687852029. The reversal of 687852013 is 310258786.

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 a de Polignac number, because none of the positive numbers 2^k-687852013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687859013) 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, 2109813 + ... + 2110138.

It is an arithmetic number, because the mean of its divisors is an integer number (173018032).

Almost surely, 2^687852013 is an apocalyptic number.

It is an amenable number.

687852013 is a deficient number, since it is larger than the sum of its proper divisors (4220115).

687852013 is a wasteful number, since it uses less digits than its factorization.

687852013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220114.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 687852013 is about 26226.9329697546. The cubic root of 687852013 is about 882.7376918883.

The spelling of 687852013 in words is "six hundred eighty-seven million, eight hundred fifty-two thousand, thirteen".