646340232 has 16 divisors (see below), whose sum is σ = 1615850640. Its totient is φ = 215446736.

The previous prime is 646340231. The next prime is 646340239. The reversal of 646340232 is 232043646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646340232.

It is not an unprimeable number, because it can be changed into a prime (646340231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13465398 + ... + 13465445.

It is an arithmetic number, because the mean of its divisors is an integer number (100990665).

Almost surely, 2^646340232 is an apocalyptic number.

It is an amenable number.

646340232 is an abundant number, since it is smaller than the sum of its proper divisors (969510408).

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

646340232 is a wasteful number, since it uses less digits than its factorization.

646340232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26930852 (or 26930848 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 646340232 is about 25423.2222977340. Note that the first 4 decimals coincide. The cubic root of 646340232 is about 864.6102834188.

Adding to 646340232 its reverse (232043646), we get a palindrome (878383878).

The spelling of 646340232 in words is "six hundred forty-six million, three hundred forty thousand, two hundred thirty-two".