685444586 has 4 divisors (see below), whose sum is σ = 1028166882. Its totient is φ = 342722292.

The previous prime is 685444567. The next prime is 685444621.

685444586 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 674388961 + 11055625 = 25969^2 + 3325^2 .

It is a super-4 number, since 4×685444586⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171361145 + ... + 171361148.

Almost surely, 2^685444586 is an apocalyptic number.

685444586 is a deficient number, since it is larger than the sum of its proper divisors (342722296).

685444586 is a wasteful number, since it uses less digits than its factorization.

685444586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342722295.

The product of its digits is 3686400, while the sum is 50.

The square root of 685444586 is about 26180.9966578815. The cubic root of 685444586 is about 881.7066510042.

The spelling of 685444586 in words is "six hundred eighty-five million, four hundred forty-four thousand, five hundred eighty-six".