687863378 has 16 divisors (see below), whose sum is σ = 1057701240. Its totient is φ = 335402496.

The previous prime is 687863317. The next prime is 687863381. The reversal of 687863378 is 873368786.

It can be written as a sum of positive squares in 4 ways, for example, as 576624169 + 111239209 = 24013^2 + 10547^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13475 + ... + 39462.

Almost surely, 2^687863378 is an apocalyptic number.

687863378 is a deficient number, since it is larger than the sum of its proper divisors (369837862).

687863378 is a wasteful number, since it uses less digits than its factorization.

687863378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53101.

The product of its digits is 8128512, while the sum is 56.

The square root of 687863378 is about 26227.1496354446. The cubic root of 687863378 is about 882.7425535245.

The spelling of 687863378 in words is "six hundred eighty-seven million, eight hundred sixty-three thousand, three hundred seventy-eight".