646331052 has 54 divisors (see below), whose sum is σ = 1554469924. Its totient is φ = 209014720.

The previous prime is 646331009. The next prime is 646331053. The reversal of 646331052 is 250133646.

It is not an unprimeable number, because it can be changed into a prime (646331053) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3610699 + ... + 3610877.

Almost surely, 2^646331052 is an apocalyptic number.

It is an amenable number.

646331052 is an abundant number, since it is smaller than the sum of its proper divisors (908138872).

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

646331052 is a wasteful number, since it uses less digits than its factorization.

646331052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 646331052 is about 25423.0417534960. The cubic root of 646331052 is about 864.6061900329.

Adding to 646331052 its reverse (250133646), we get a palindrome (896464698).

The spelling of 646331052 in words is "six hundred forty-six million, three hundred thirty-one thousand, fifty-two".