685830649 has 8 divisors (see below), whose sum is σ = 784150848. Its totient is φ = 587596560.

The previous prime is 685830641. The next prime is 685830659. The reversal of 685830649 is 946038586.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 685830649 - 2³ = 685830641 is a prime.

It is a super-2 number, since 2×685830649² = 940727358215522402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685830641) 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, 3442 + ... + 37195.

It is an arithmetic number, because the mean of its divisors is an integer number (98018856).

Almost surely, 2^685830649 is an apocalyptic number.

It is an amenable number.

685830649 is a deficient number, since it is larger than the sum of its proper divisors (98320199).

685830649 is a wasteful number, since it uses less digits than its factorization.

685830649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43055.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 685830649 is about 26188.3685822542. The cubic root of 685830649 is about 881.8721545012.

The spelling of 685830649 in words is "six hundred eighty-five million, eight hundred thirty thousand, six hundred forty-nine".