645719332 has 24 divisors (see below), whose sum is σ = 1218500640. Its totient is φ = 298405440.

The previous prime is 645719329. The next prime is 645719339. The reversal of 645719332 is 233917546.

It is a happy number.

645719332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645719339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100498 + ... + 106729.

It is an arithmetic number, because the mean of its divisors is an integer number (50770860).

Almost surely, 2^645719332 is an apocalyptic number.

It is an amenable number.

645719332 is a deficient number, since it is larger than the sum of its proper divisors (572781308).

645719332 is a wasteful number, since it uses less digits than its factorization.

645719332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207291 (or 207289 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 645719332 is about 25411.0080870476. The cubic root of 645719332 is about 864.3333351016. Note that the first 5 decimals are identical.

The spelling of 645719332 in words is "six hundred forty-five million, seven hundred nineteen thousand, three hundred thirty-two".