320651778880 has 56 divisors (see below), whose sum is σ = 767817839520. Its totient is φ = 127544148480.

The previous prime is 320651778857. The next prime is 320651778911. The reversal of 320651778880 is 88877156023.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2741706 + ... + 2856265.

Almost surely, 2^320651778880 is an apocalyptic number.

It is an amenable number.

320651778880 is an abundant number, since it is smaller than the sum of its proper divisors (447166060640).

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

320651778880 is a wasteful number, since it uses less digits than its factorization.

320651778880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5598167 (or 5598157 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 320651778880 in words is "three hundred twenty billion, six hundred fifty-one million, seven hundred seventy-eight thousand, eight hundred eighty".