331640128 has 28 divisors (see below), whose sum is σ = 686714400. Its totient is φ = 158609792.

The previous prime is 331640119. The next prime is 331640129. The reversal of 331640128 is 821046133.

It is a junction number, because it is equal to n+sod(n) for n = 331640096 and 331640105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331640129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111178 + ... + 114121.

Almost surely, 2^331640128 is an apocalyptic number.

It is an amenable number.

331640128 is an abundant number, since it is smaller than the sum of its proper divisors (355074272).

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

331640128 is a wasteful number, since it uses less digits than its factorization.

331640128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225334 (or 225324 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 331640128 is about 18210.9892098150. The cubic root of 331640128 is about 692.1852778861.

The spelling of 331640128 in words is "three hundred thirty-one million, six hundred forty thousand, one hundred twenty-eight".