645347704 has 8 divisors (see below), whose sum is σ = 1210026960. Its totient is φ = 322673848.

The previous prime is 645347699. The next prime is 645347707. The reversal of 645347704 is 407743546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645347707) 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 as a sum of consecutive naturals, namely, 40334224 + ... + 40334239.

It is an arithmetic number, because the mean of its divisors is an integer number (151253370).

Almost surely, 2^645347704 is an apocalyptic number.

It is an amenable number.

645347704 is a deficient number, since it is larger than the sum of its proper divisors (564679256).

645347704 is a wasteful number, since it uses less digits than its factorization.

645347704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80668469 (or 80668465 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 40.

The square root of 645347704 is about 25403.6946919144. The cubic root of 645347704 is about 864.1674879633.

The spelling of 645347704 in words is "six hundred forty-five million, three hundred forty-seven thousand, seven hundred four".