645363324 has 72 divisors (see below), whose sum is σ = 1696909760. Its totient is φ = 206623872.

The previous prime is 645363311. The next prime is 645363343. The reversal of 645363324 is 423363546.

645363324 is a `hidden beast` number, since 645 + 3 + 6 + 3 + 3 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102162 + ... + 108294.

Almost surely, 2^645363324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645363324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848454880).

645363324 is an abundant number, since it is smaller than the sum of its proper divisors (1051546436).

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

645363324 is a wasteful number, since it uses less digits than its factorization.

645363324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259 (or 6254 counting only the distinct ones).

The product of its digits is 155520, while the sum is 36.

The square root of 645363324 is about 25404.0021256494. The cubic root of 645363324 is about 864.1744600122.

The spelling of 645363324 in words is "six hundred forty-five million, three hundred sixty-three thousand, three hundred twenty-four".