646621232 has 10 divisors (see below), whose sum is σ = 1252828668. Its totient is φ = 323310608.

The previous prime is 646621201. The next prime is 646621249. The reversal of 646621232 is 232126646.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20206898 + ... + 20206929.

Almost surely, 2^646621232 is an apocalyptic number.

It is an amenable number.

646621232 is a deficient number, since it is larger than the sum of its proper divisors (606207436).

646621232 is a wasteful number, since it uses less digits than its factorization.

646621232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40413835 (or 40413829 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 646621232 is about 25428.7481406380. The cubic root of 646621232 is about 864.7355633036.

Adding to 646621232 its reverse (232126646), we get a palindrome (878747878).

The spelling of 646621232 in words is "six hundred forty-six million, six hundred twenty-one thousand, two hundred thirty-two".