645200678 has 16 divisors (see below), whose sum is σ = 995626944. Its totient is φ = 313425600.

The previous prime is 645200629. The next prime is 645200707. The reversal of 645200678 is 876002546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 12173 + ... + 37928.

It is an arithmetic number, because the mean of its divisors is an integer number (62226684).

Almost surely, 2^645200678 is an apocalyptic number.

645200678 is a deficient number, since it is larger than the sum of its proper divisors (350426266).

645200678 is a wasteful number, since it uses less digits than its factorization.

645200678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50287.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 645200678 is about 25400.8007354099. The cubic root of 645200678 is about 864.1018568117.

The spelling of 645200678 in words is "six hundred forty-five million, two hundred thousand, six hundred seventy-eight".