647271816 has 32 divisors (see below), whose sum is σ = 1670380800. Its totient is φ = 208797120.

The previous prime is 647271811. The next prime is 647271869. The reversal of 647271816 is 618172746.

It is not an unprimeable number, because it can be changed into a prime (647271811) 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, 434251 + ... + 435738.

It is an arithmetic number, because the mean of its divisors is an integer number (52199400).

Almost surely, 2^647271816 is an apocalyptic number.

It is an amenable number.

647271816 is an abundant number, since it is smaller than the sum of its proper divisors (1023108984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647271816 is a wasteful number, since it uses less digits than its factorization.

647271816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870029 (or 870025 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 647271816 is about 25441.5372177076. The cubic root of 647271816 is about 865.0254777710.

The spelling of 647271816 in words is "six hundred forty-seven million, two hundred seventy-one thousand, eight hundred sixteen".