687873478 has 4 divisors (see below), whose sum is σ = 1031810220. Its totient is φ = 343936738.

The previous prime is 687873467. The next prime is 687873479. The reversal of 687873478 is 874378786.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687873479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171968368 + ... + 171968371.

It is an arithmetic number, because the mean of its divisors is an integer number (257952555).

Almost surely, 2^687873478 is an apocalyptic number.

687873478 is a deficient number, since it is larger than the sum of its proper divisors (343936742).

687873478 is a wasteful number, since it uses less digits than its factorization.

687873478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343936741.

The product of its digits is 12644352, while the sum is 58.

The square root of 687873478 is about 26227.3421833018. The cubic root of 687873478 is about 882.7468739833.

The spelling of 687873478 in words is "six hundred eighty-seven million, eight hundred seventy-three thousand, four hundred seventy-eight".