647216 has 20 divisors (see below), whose sum is σ = 1320600. Its totient is φ = 306432.

The previous prime is 647209. The next prime is 647219. The reversal of 647216 is 612746.

It is a super-3 number, since 3×647216³ = 813334116604121088, which contains 333 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647216.

It is not an unprimeable number, because it can be changed into a prime (647219) by changing a digit.

647216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (66030).

2⁶⁴⁷²¹⁶ is an apocalyptic number.

It is an amenable number.

647216 is an abundant number, since it is smaller than the sum of its proper divisors (673384).

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

647216 is a wasteful number, since it uses less digits than its factorization.

647216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156 (or 2150 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 647216 is about 804.4973586035. The cubic root of 647216 is about 86.5000612560.

The spelling of 647216 in words is "six hundred forty-seven thousand, two hundred sixteen".