685557946 has 8 divisors (see below), whose sum is σ = 1088827380. Its totient is φ = 322615488.

The previous prime is 685557931. The next prime is 685557947. The reversal of 685557946 is 649755586.

685557946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 602948025 + 82609921 = 24555^2 + 9089^2 .

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

It is not an unprimeable number, because it can be changed into a prime (685557947) 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, 10081701 + ... + 10081768.

Almost surely, 2^685557946 is an apocalyptic number.

685557946 is a deficient number, since it is larger than the sum of its proper divisors (403269434).

685557946 is a wasteful number, since it uses less digits than its factorization.

685557946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20163488.

The product of its digits is 9072000, while the sum is 55.

The square root of 685557946 is about 26183.1614974204. The cubic root of 685557946 is about 881.7552543771.

The spelling of 685557946 in words is "six hundred eighty-five million, five hundred fifty-seven thousand, nine hundred forty-six".