685140278 has 4 divisors (see below), whose sum is σ = 1027710420. Its totient is φ = 342570138.

The previous prime is 685140277. The next prime is 685140289. The reversal of 685140278 is 872041586.

685140278 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 is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685140277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171285068 + ... + 171285071.

It is an arithmetic number, because the mean of its divisors is an integer number (256927605).

Almost surely, 2^685140278 is an apocalyptic number.

685140278 is a deficient number, since it is larger than the sum of its proper divisors (342570142).

685140278 is a wasteful number, since it uses less digits than its factorization.

685140278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342570141.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 685140278 is about 26175.1843928558. The cubic root of 685140278 is about 881.5761517103.

The spelling of 685140278 in words is "six hundred eighty-five million, one hundred forty thousand, two hundred seventy-eight".