685815342 has 16 divisors (see below), whose sum is σ = 1403529600. Its totient is φ = 223288632.

The previous prime is 685815329. The next prime is 685815349. The reversal of 685815342 is 243518586.

It is a junction number, because it is equal to n+sod(n) for n = 685815294 and 685815303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685815349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328842 + ... + 1329357.

It is an arithmetic number, because the mean of its divisors is an integer number (87720600).

Almost surely, 2^685815342 is an apocalyptic number.

685815342 is an abundant number, since it is smaller than the sum of its proper divisors (717714258).

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

685815342 is a wasteful number, since it uses less digits than its factorization.

685815342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658247.

The product of its digits is 230400, while the sum is 42.

The square root of 685815342 is about 26188.0763325602. The cubic root of 685815342 is about 881.8655936408.

The spelling of 685815342 in words is "six hundred eighty-five million, eight hundred fifteen thousand, three hundred forty-two".