687440635 has 16 divisors (see below), whose sum is σ = 955694016. Its totient is φ = 464928768.

The previous prime is 687440623. The next prime is 687440641. The reversal of 687440635 is 536044786.

It is a cyclic number.

It is not a de Polignac number, because 687440635 - 2²³ = 679052027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687440591 and 687440600.

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 15 ways as a sum of consecutive naturals, for example, 131974 + ... + 137083.

It is an arithmetic number, because the mean of its divisors is an integer number (59730876).

Almost surely, 2^687440635 is an apocalyptic number.

687440635 is a deficient number, since it is larger than the sum of its proper divisors (268253381).

687440635 is a wasteful number, since it uses less digits than its factorization.

687440635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269142.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 687440635 is about 26219.0891336827. The cubic root of 687440635 is about 882.5616795695.

The spelling of 687440635 in words is "six hundred eighty-seven million, four hundred forty thousand, six hundred thirty-five".