645916352 has 28 divisors (see below), whose sum is σ = 1282720320. Its totient is φ = 322711296.

The previous prime is 645916339. The next prime is 645916357. The reversal of 645916352 is 253619546.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (645916357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103793 + ... + 109839.

It is an arithmetic number, because the mean of its divisors is an integer number (45811440).

Almost surely, 2^645916352 is an apocalyptic number.

It is an amenable number.

645916352 is a deficient number, since it is larger than the sum of its proper divisors (636803968).

645916352 is a wasteful number, since it uses less digits than its factorization.

645916352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728 (or 7718 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 645916352 is about 25414.8844577346. The cubic root of 645916352 is about 864.4212337848.

The spelling of 645916352 in words is "six hundred forty-five million, nine hundred sixteen thousand, three hundred fifty-two".