687643356 has 24 divisors (see below), whose sum is σ = 1626482704. Its totient is φ = 226074240.

The previous prime is 687643343. The next prime is 687643381. The reversal of 687643356 is 653346786.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 391615 + ... + 393366.

Almost surely, 2^687643356 is an apocalyptic number.

It is an amenable number.

687643356 is an abundant number, since it is smaller than the sum of its proper divisors (938839348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687643356 is a wasteful number, since it uses less digits than its factorization.

687643356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785061 (or 785059 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 48.

The square root of 687643356 is about 26222.9547534217. The cubic root of 687643356 is about 882.6484246125.

The spelling of 687643356 in words is "six hundred eighty-seven million, six hundred forty-three thousand, three hundred fifty-six".