687405316 has 24 divisors (see below), whose sum is σ = 1298032344. Its totient is φ = 316642560.

The previous prime is 687405311. The next prime is 687405331. The reversal of 687405316 is 613504786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44275716 + 643129600 = 6654^2 + 25360^2 .

It is not an unprimeable number, because it can be changed into a prime (687405311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14406 + ... + 39778.

It is an arithmetic number, because the mean of its divisors is an integer number (54084681).

Almost surely, 2^687405316 is an apocalyptic number.

It is an amenable number.

687405316 is a deficient number, since it is larger than the sum of its proper divisors (610627028).

687405316 is a wasteful number, since it uses less digits than its factorization.

687405316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25911 (or 25909 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 687405316 is about 26218.4155890473. The cubic root of 687405316 is about 882.5465646984.

The spelling of 687405316 in words is "six hundred eighty-seven million, four hundred five thousand, three hundred sixteen".