685872042 has 8 divisors (see below), whose sum is σ = 1371744096. Its totient is φ = 228624012.

The previous prime is 685872041. The next prime is 685872073. The reversal of 685872042 is 240278586.

It is a happy number.

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

685872042 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 685871985 and 685872003.

It is not an unprimeable number, because it can be changed into a prime (685872041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57155998 + ... + 57156009.

It is an arithmetic number, because the mean of its divisors is an integer number (171468012).

Almost surely, 2^685872042 is an apocalyptic number.

685872042 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.

685872042 is a wasteful number, since it uses less digits than its factorization.

685872042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114312012.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 685872042 is about 26189.1588639269. The cubic root of 685872042 is about 881.8898958099.

The spelling of 685872042 in words is "six hundred eighty-five million, eight hundred seventy-two thousand, forty-two".