645326384 has 20 divisors (see below), whose sum is σ = 1267932240. Its totient is φ = 318118080.

The previous prime is 645326377. The next prime is 645326399. The reversal of 645326384 is 483623546.

645326384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645326384² = 832892283773030912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282899 + ... + 285170.

It is an arithmetic number, because the mean of its divisors is an integer number (63396612).

Almost surely, 2^645326384 is an apocalyptic number.

It is an amenable number.

645326384 is a deficient number, since it is larger than the sum of its proper divisors (622605856).

645326384 is a wasteful number, since it uses less digits than its factorization.

645326384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568148 (or 568142 counting only the distinct ones).

The product of its digits is 414720, while the sum is 41.

The square root of 645326384 is about 25403.2750644479. The cubic root of 645326384 is about 864.1579715152.

The spelling of 645326384 in words is "six hundred forty-five million, three hundred twenty-six thousand, three hundred eighty-four".