687478843 has 8 divisors (see below), whose sum is σ = 748616400. Its totient is φ = 628836768.

The previous prime is 687478837. The next prime is 687478903. The reversal of 687478843 is 348874786.

It is a happy number.

687478843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687478843 - 2⁹ = 687478331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687478543) 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, 623296 + ... + 624397.

It is an arithmetic number, because the mean of its divisors is an integer number (93577050).

Almost surely, 2^687478843 is an apocalyptic number.

687478843 is a deficient number, since it is larger than the sum of its proper divisors (61137557).

687478843 is a wasteful number, since it uses less digits than its factorization.

687478843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247741.

The product of its digits is 7225344, while the sum is 55.

The square root of 687478843 is about 26219.8177529898. The cubic root of 687478843 is about 882.5780302138.

The spelling of 687478843 in words is "six hundred eighty-seven million, four hundred seventy-eight thousand, eight hundred forty-three".