331445988 has 72 divisors (see below), whose sum is σ = 878787000. Its totient is φ = 105186816.

The previous prime is 331445987. The next prime is 331446023. The reversal of 331445988 is 889544133.

It can be written as a sum of positive squares in 4 ways, for example, as 4848804 + 326597184 = 2202^2 + 18072^2 .

It is a super-2 number, since 2×331445988² = 219712885922592288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331445981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74038 + ... + 78386.

It is an arithmetic number, because the mean of its divisors is an integer number (12205375).

Almost surely, 2^331445988 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 331445988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439393500).

331445988 is an abundant number, since it is smaller than the sum of its proper divisors (547341012).

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

331445988 is a wasteful number, since it uses less digits than its factorization.

331445988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461 (or 4456 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 331445988 is about 18205.6581314711. The cubic root of 331445988 is about 692.0501845837.

The spelling of 331445988 in words is "three hundred thirty-one million, four hundred forty-five thousand, nine hundred eighty-eight".