687895213378 has 4 divisors (see below), whose sum is σ = 1031842820070. Its totient is φ = 343947606688.

The previous prime is 687895213339. The next prime is 687895213393. The reversal of 687895213378 is 873312598786.

687895213378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 687478114449 + 417098929 = 829143^2 + 20423^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171973803343 + ... + 171973803346.

Almost surely, 2^687895213378 is an apocalyptic number.

687895213378 is a deficient number, since it is larger than the sum of its proper divisors (343947606692).

687895213378 is a wasteful number, since it uses less digits than its factorization.

687895213378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343947606691.

The product of its digits is 121927680, while the sum is 67.

The spelling of 687895213378 in words is "six hundred eighty-seven billion, eight hundred ninety-five million, two hundred thirteen thousand, three hundred seventy-eight".