343664881 has 12 divisors (see below), whose sum is σ = 401992500. Its totient is φ = 292934880.

The previous prime is 343664863. The next prime is 343664887. The reversal of 343664881 is 188466343.

It can be written as a sum of positive squares in 2 ways, for example, as 64240225 + 279424656 = 8015^2 + 16716^2 .

It is not a de Polignac number, because 343664881 - 2⁹ = 343664369 is a prime.

It is a super-2 number, since 2×343664881² = 236211100865488322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (343664887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10506 + ... + 28243.

It is an arithmetic number, because the mean of its divisors is an integer number (33499375).

Almost surely, 2^343664881 is an apocalyptic number.

It is an amenable number.

343664881 is a deficient number, since it is larger than the sum of its proper divisors (58327619).

343664881 is a wasteful number, since it uses less digits than its factorization.

343664881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38944 (or 38937 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 343664881 is about 18538.2005868962. The cubic root of 343664881 is about 700.4520080639.

The spelling of 343664881 in words is "three hundred forty-three million, six hundred sixty-four thousand, eight hundred eighty-one".