645435704 has 16 divisors (see below), whose sum is σ = 1212894000. Its totient is φ = 321997312.

The previous prime is 645435701. The next prime is 645435727. The reversal of 645435704 is 407534546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645435701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 86252 + ... + 93435.

It is an arithmetic number, because the mean of its divisors is an integer number (75805875).

Almost surely, 2^645435704 is an apocalyptic number.

It is an amenable number.

645435704 is a deficient number, since it is larger than the sum of its proper divisors (567458296).

645435704 is a wasteful number, since it uses less digits than its factorization.

645435704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180142 (or 180138 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 38.

The square root of 645435704 is about 25405.4266643959. The cubic root of 645435704 is about 864.2067656437.

The spelling of 645435704 in words is "six hundred forty-five million, four hundred thirty-five thousand, seven hundred four".