646335328 has 24 divisors (see below), whose sum is σ = 1327799088. Its totient is φ = 309116544.

The previous prime is 646335311. The next prime is 646335341. The reversal of 646335328 is 823533646.

It is a happy number.

It is a congruent number.

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, 438351 + ... + 439822.

It is an arithmetic number, because the mean of its divisors is an integer number (55324962).

Almost surely, 2^646335328 is an apocalyptic number.

It is an amenable number.

646335328 is an abundant number, since it is smaller than the sum of its proper divisors (681463760).

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

646335328 is a wasteful number, since it uses less digits than its factorization.

646335328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878206 (or 878198 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 646335328 is about 25423.1258502962. The cubic root of 646335328 is about 864.6080967173.

The spelling of 646335328 in words is "six hundred forty-six million, three hundred thirty-five thousand, three hundred twenty-eight".