645374806 has 16 divisors (see below), whose sum is σ = 984130560. Its totient is φ = 317353960.

The previous prime is 645374803. The next prime is 645374827. The reversal of 645374806 is 608473546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645374801) by changing a digit.

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, 54075 + ... + 64921.

It is an arithmetic number, because the mean of its divisors is an integer number (61508160).

Almost surely, 2^645374806 is an apocalyptic number.

645374806 is a deficient number, since it is larger than the sum of its proper divisors (338755754).

645374806 is a wasteful number, since it uses less digits than its factorization.

645374806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11339.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 645374806 is about 25404.2281126587. The cubic root of 645374806 is about 864.1795849767.

The spelling of 645374806 in words is "six hundred forty-five million, three hundred seventy-four thousand, eight hundred six".