687284056 has 8 divisors (see below), whose sum is σ = 1288657620. Its totient is φ = 343642024.

The previous prime is 687284051. The next prime is 687284071. The reversal of 687284056 is 650482786.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×687284056² = 944718747263622272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 687283997 and 687284015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687284051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42955246 + ... + 42955261.

Almost surely, 2^687284056 is an apocalyptic number.

It is an amenable number.

687284056 is a deficient number, since it is larger than the sum of its proper divisors (601373564).

687284056 is a wasteful number, since it uses less digits than its factorization.

687284056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85910513 (or 85910509 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 687284056 is about 26216.1029903378. The cubic root of 687284056 is about 882.4946671801.

The spelling of 687284056 in words is "six hundred eighty-seven million, two hundred eighty-four thousand, fifty-six".