685078278 has 8 divisors (see below), whose sum is σ = 1370156568. Its totient is φ = 228359424.

The previous prime is 685078181. The next prime is 685078321. The reversal of 685078278 is 872870586.

685078278 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.

685078278 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 685078278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57089851 + ... + 57089862.

It is an arithmetic number, because the mean of its divisors is an integer number (171269571).

Almost surely, 2^685078278 is an apocalyptic number.

685078278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685078278 is a wasteful number, since it uses less digits than its factorization.

685078278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114179718.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The square root of 685078278 is about 26174.0000382059. Note that the first 4 decimals coincide. The cubic root of 685078278 is about 881.5495589224.

The spelling of 685078278 in words is "six hundred eighty-five million, seventy-eight thousand, two hundred seventy-eight".