647545906 has 16 divisors (see below), whose sum is σ = 1112884416. Its totient is φ = 276818256.

The previous prime is 647545889. The next prime is 647545909. The reversal of 647545906 is 609545746.

It is not an unprimeable number, because it can be changed into a prime (647545909) 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, 52696 + ... + 63811.

It is an arithmetic number, because the mean of its divisors is an integer number (69555276).

Almost surely, 2^647545906 is an apocalyptic number.

647545906 is a deficient number, since it is larger than the sum of its proper divisors (465338510).

647545906 is a wasteful number, since it uses less digits than its factorization.

647545906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116913.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 647545906 is about 25446.9233110803. The cubic root of 647545906 is about 865.1475601115.

The spelling of 647545906 in words is "six hundred forty-seven million, five hundred forty-five thousand, nine hundred six".