320681388 has 12 divisors (see below), whose sum is σ = 748256600. Its totient is φ = 106893792.

The previous prime is 320681351. The next prime is 320681393. The reversal of 320681388 is 883186023.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×320681388³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13361713 + ... + 13361736.

Almost surely, 2^320681388 is an apocalyptic number.

It is an amenable number.

320681388 is an abundant number, since it is smaller than the sum of its proper divisors (427575212).

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

320681388 is a wasteful number, since it uses less digits than its factorization.

320681388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26723456 (or 26723454 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 320681388 is about 17907.5790658592. The cubic root of 320681388 is about 684.4755166136.

The spelling of 320681388 in words is "three hundred twenty million, six hundred eighty-one thousand, three hundred eighty-eight".