646325144 has 8 divisors (see below), whose sum is σ = 1211859660. Its totient is φ = 323162568.

The previous prime is 646325129. The next prime is 646325161. The reversal of 646325144 is 441523646.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40395314 + ... + 40395329.

Almost surely, 2^646325144 is an apocalyptic number.

It is an amenable number.

646325144 is a deficient number, since it is larger than the sum of its proper divisors (565534516).

646325144 is a wasteful number, since it uses less digits than its factorization.

646325144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80790649 (or 80790645 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 646325144 is about 25422.9255594237. The cubic root of 646325144 is about 864.6035556198.

The spelling of 646325144 in words is "six hundred forty-six million, three hundred twenty-five thousand, one hundred forty-four".