687871547 has 16 divisors (see below), whose sum is σ = 761201280. Its totient is φ = 616377600.

The previous prime is 687871543. The next prime is 687871589. The reversal of 687871547 is 745178786.

It is a cyclic number.

It is not a de Polignac number, because 687871547 - 2² = 687871543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687871543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739979 + ... + 740907.

It is an arithmetic number, because the mean of its divisors is an integer number (47575080).

Almost surely, 2^687871547 is an apocalyptic number.

687871547 is a deficient number, since it is larger than the sum of its proper divisors (73329733).

687871547 is a wasteful number, since it uses less digits than its factorization.

687871547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834.

The product of its digits is 2634240, while the sum is 53.

The square root of 687871547 is about 26227.3053705485. The cubic root of 687871547 is about 882.7460479661.

The spelling of 687871547 in words is "six hundred eighty-seven million, eight hundred seventy-one thousand, five hundred forty-seven".