331320640 has 112 divisors (see below), whose sum is σ = 907231104. Its totient is φ = 112896000.

The previous prime is 331320629. The next prime is 331320643. The reversal of 331320640 is 46023133.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331320643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472290 + ... + 472990.

Almost surely, 2^331320640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331320640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453615552).

331320640 is an abundant number, since it is smaller than the sum of its proper divisors (575910464).

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

331320640 is a wasteful number, since it uses less digits than its factorization.

331320640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 331320640 is about 18202.2152497986. The cubic root of 331320640 is about 691.9629325150.

Adding to 331320640 its reverse (46023133), we get a palindrome (377343773).

The spelling of 331320640 in words is "three hundred thirty-one million, three hundred twenty thousand, six hundred forty".