647215 has 4 divisors (see below), whose sum is σ = 776664. Its totient is φ = 517768.

The previous prime is 647209. The next prime is 647219. The reversal of 647215 is 512746.

647215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647215 is a prime.

It is a super-3 number, since 3×647215³ = 813330346612990125, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647215.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64717 + ... + 64726.

It is an arithmetic number, because the mean of its divisors is an integer number (194166).

2⁶⁴⁷²¹⁵ is an apocalyptic number.

647215 is a deficient number, since it is larger than the sum of its proper divisors (129449).

647215 is a wasteful number, since it uses less digits than its factorization.

647215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129448.

The product of its digits is 1680, while the sum is 25.

The square root of 647215 is about 804.4967370972. The cubic root of 647215 is about 86.5000167062.

The spelling of 647215 in words is "six hundred forty-seven thousand, two hundred fifteen".