646140326 has 16 divisors (see below), whose sum is σ = 1044477168. Its totient is φ = 298015200.

The previous prime is 646140307. The next prime is 646140343. The reversal of 646140326 is 623041646.

It is a junction number, because it is equal to n+sod(n) for n = 646140292 and 646140301.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34481 + ... + 49811.

It is an arithmetic number, because the mean of its divisors is an integer number (65279823).

Almost surely, 2^646140326 is an apocalyptic number.

646140326 is a deficient number, since it is larger than the sum of its proper divisors (398336842).

646140326 is a wasteful number, since it uses less digits than its factorization.

646140326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16967.

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

The square root of 646140326 is about 25419.2904306946. The cubic root of 646140326 is about 864.5211360436.

The spelling of 646140326 in words is "six hundred forty-six million, one hundred forty thousand, three hundred twenty-six".