343520646 has 64 divisors (see below), whose sum is σ = 840184320. Its totient is φ = 91445760.

The previous prime is 343520633. The next prime is 343520647. The reversal of 343520646 is 646025343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343520647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45150 + ... + 52206.

It is an arithmetic number, because the mean of its divisors is an integer number (13127880).

Almost surely, 2^343520646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 343520646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420092160).

343520646 is an abundant number, since it is smaller than the sum of its proper divisors (496663674).

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

343520646 is a wasteful number, since it uses less digits than its factorization.

343520646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7149.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 343520646 is about 18534.3099682724. The cubic root of 343520646 is about 700.3540018974.

Adding to 343520646 its reverse (646025343), we get a palindrome (989545989).

The spelling of 343520646 in words is "three hundred forty-three million, five hundred twenty thousand, six hundred forty-six".