687516479 has 4 divisors (see below), whose sum is σ = 740402376. Its totient is φ = 634630584.

The previous prime is 687516469. The next prime is 687516497. The reversal of 687516479 is 974615786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687516479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687516479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687516469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26442929 + ... + 26442954.

It is an arithmetic number, because the mean of its divisors is an integer number (185100594).

Almost surely, 2^687516479 is an apocalyptic number.

687516479 is a deficient number, since it is larger than the sum of its proper divisors (52885897).

687516479 is a wasteful number, since it uses less digits than its factorization.

687516479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52885896.

The product of its digits is 2540160, while the sum is 53.

The square root of 687516479 is about 26220.5354445709. The cubic root of 687516479 is about 882.5941354855.

The spelling of 687516479 in words is "six hundred eighty-seven million, five hundred sixteen thousand, four hundred seventy-nine".