645019214 has 32 divisors (see below), whose sum is σ = 1117670400. Its totient is φ = 273471840.

The previous prime is 645019213. The next prime is 645019217. The reversal of 645019214 is 412910546.

645019214 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645019213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896747 + ... + 897465.

It is an arithmetic number, because the mean of its divisors is an integer number (34927200).

Almost surely, 2^645019214 is an apocalyptic number.

645019214 is a deficient number, since it is larger than the sum of its proper divisors (472651186).

645019214 is a wasteful number, since it uses less digits than its factorization.

645019214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 645019214 is about 25397.2284708391. The cubic root of 645019214 is about 864.0208390821.

The spelling of 645019214 in words is "six hundred forty-five million, nineteen thousand, two hundred fourteen".