687844377 has 12 divisors (see below), whose sum is σ = 1083876144. Its totient is φ = 416875320.

The previous prime is 687844373. The next prime is 687844387. The reversal of 687844377 is 773448786.

687844377 is a `hidden beast` number, since 68 + 78 + 443 + 77 = 666.

It is not a de Polignac number, because 687844377 - 2² = 687844373 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687844373) 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 in 11 ways as a sum of consecutive naturals, for example, 3473863 + ... + 3474060.

It is an arithmetic number, because the mean of its divisors is an integer number (90323012).

Almost surely, 2^687844377 is an apocalyptic number.

It is an amenable number.

687844377 is a deficient number, since it is larger than the sum of its proper divisors (396031767).

687844377 is a wasteful number, since it uses less digits than its factorization.

687844377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947940 (or 6947937 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 54.

The square root of 687844377 is about 26226.7873938079. The cubic root of 687844377 is about 882.7344253863.

The spelling of 687844377 in words is "six hundred eighty-seven million, eight hundred forty-four thousand, three hundred seventy-seven".