687346361 has 4 divisors (see below), whose sum is σ = 740219172. Its totient is φ = 634473552.

The previous prime is 687346351. The next prime is 687346369. The reversal of 687346361 is 163643786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 402243136 + 285103225 = 20056^2 + 16885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687346361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687346369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26436386 + ... + 26436411.

It is an arithmetic number, because the mean of its divisors is an integer number (185054793).

Almost surely, 2^687346361 is an apocalyptic number.

It is an amenable number.

687346361 is a deficient number, since it is larger than the sum of its proper divisors (52872811).

687346361 is a wasteful number, since it uses less digits than its factorization.

687346361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52872810.

The product of its digits is 435456, while the sum is 44.

The square root of 687346361 is about 26217.2912597774. The cubic root of 687346361 is about 882.5213335773.

The spelling of 687346361 in words is "six hundred eighty-seven million, three hundred forty-six thousand, three hundred sixty-one".