685242242 has 8 divisors (see below), whose sum is σ = 1028238732. Its totient is φ = 342496000.

The previous prime is 685242193. The next prime is 685242263. The reversal of 685242242 is 242242586.

It can be written as a sum of positive squares in 2 ways, for example, as 681157801 + 4084441 = 26099^2 + 2021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55559 + ... + 66762.

Almost surely, 2^685242242 is an apocalyptic number.

685242242 is a deficient number, since it is larger than the sum of its proper divisors (342996490).

685242242 is a wasteful number, since it uses less digits than its factorization.

685242242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125124.

The product of its digits is 61440, while the sum is 35.

The square root of 685242242 is about 26177.1320430638. The cubic root of 685242242 is about 881.6198822060.

It can be divided in two parts, 6852 and 42242, that added together give a palindrome (49094).

The spelling of 685242242 in words is "six hundred eighty-five million, two hundred forty-two thousand, two hundred forty-two".