321680240 has 40 divisors (see below), whose sum is σ = 854751840. Its totient is φ = 110290176.

The previous prime is 321680237. The next prime is 321680251. The reversal of 321680240 is 42086123.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286655 + ... + 287774.

It is an arithmetic number, because the mean of its divisors is an integer number (21368796).

Almost surely, 2^321680240 is an apocalyptic number.

It is an amenable number.

321680240 is an abundant number, since it is smaller than the sum of its proper divisors (533071600).

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

321680240 is a wasteful number, since it uses less digits than its factorization.

321680240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574449 (or 574443 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 321680240 is about 17935.4464678190. The cubic root of 321680240 is about 685.1854436028.

The spelling of 321680240 in words is "three hundred twenty-one million, six hundred eighty thousand, two hundred forty".