331640012 has 24 divisors (see below), whose sum is σ = 670375440. Its totient is φ = 141877760.

The previous prime is 331640009. The next prime is 331640039. The reversal of 331640012 is 210046133.

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, 220937 + ... + 222432.

It is an arithmetic number, because the mean of its divisors is an integer number (27932310).

Almost surely, 2^331640012 is an apocalyptic number.

It is an amenable number.

331640012 is an abundant number, since it is smaller than the sum of its proper divisors (338735428).

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

331640012 is a wasteful number, since it uses less digits than its factorization.

331640012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443401 (or 443399 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 331640012 is about 18210.9860249246. The cubic root of 331640012 is about 692.1851971826.

Adding to 331640012 its reverse (210046133), we get a palindrome (541686145).

The spelling of 331640012 in words is "three hundred thirty-one million, six hundred forty thousand, twelve".