645755204 has 24 divisors (see below), whose sum is σ = 1201112640. Its totient is φ = 302910624.

The previous prime is 645755119. The next prime is 645755221. The reversal of 645755204 is 402557546.

645755204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33419 + ... + 49074.

It is an arithmetic number, because the mean of its divisors is an integer number (50046360).

Almost surely, 2^645755204 is an apocalyptic number.

It is an amenable number.

645755204 is a deficient number, since it is larger than the sum of its proper divisors (555357436).

645755204 is a wasteful number, since it uses less digits than its factorization.

645755204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82619 (or 82617 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 38.

The square root of 645755204 is about 25411.7139130756. The cubic root of 645755204 is about 864.3493403997.

The spelling of 645755204 in words is "six hundred forty-five million, seven hundred fifty-five thousand, two hundred four".