645969324 has 96 divisors (see below), whose sum is σ = 2023773696. Its totient is φ = 154874880.

The previous prime is 645969319. The next prime is 645969361. The reversal of 645969324 is 423969546.

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 31 ways as a sum of consecutive naturals, for example, 14877 + ... + 38900.

It is an arithmetic number, because the mean of its divisors is an integer number (21080976).

Almost surely, 2^645969324 is an apocalyptic number.

It is an amenable number.

645969324 is an abundant number, since it is smaller than the sum of its proper divisors (1377804372).

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

645969324 is a wasteful number, since it uses less digits than its factorization.

645969324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53815 (or 53813 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 48.

The square root of 645969324 is about 25415.9265815748. The cubic root of 645969324 is about 864.4448637124. Note that the first 3 decimals are identical.

It can be divided in two parts, 64596 and 9324, that added together give a triangular number (73920 = T₃₈₄).

The spelling of 645969324 in words is "six hundred forty-five million, nine hundred sixty-nine thousand, three hundred twenty-four".