645784803 has 24 divisors (see below), whose sum is σ = 942786000. Its totient is φ = 425939904.

The previous prime is 645784771. The next prime is 645784817. The reversal of 645784803 is 308487546.

It is not a de Polignac number, because 645784803 - 2⁵ = 645784771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645784873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379248 + ... + 380946.

It is an arithmetic number, because the mean of its divisors is an integer number (39282750).

Almost surely, 2^645784803 is an apocalyptic number.

645784803 is a deficient number, since it is larger than the sum of its proper divisors (297001197).

645784803 is a wasteful number, since it uses less digits than its factorization.

645784803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 645784803 is about 25412.2962952977. The cubic root of 645784803 is about 864.3625463768.

The spelling of 645784803 in words is "six hundred forty-five million, seven hundred eighty-four thousand, eight hundred three".