647845 has 8 divisors (see below), whose sum is σ = 848160. Its totient is φ = 471120.

The previous prime is 647839. The next prime is 647851. The reversal of 647845 is 548746.

647845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (647839) and next prime (647851).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647845 - 2³ = 647837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5835 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (106020).

2⁶⁴⁷⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

647845 is a deficient number, since it is larger than the sum of its proper divisors (200315).

647845 is a wasteful number, since it uses less digits than its factorization.

647845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11795.

The product of its digits is 26880, while the sum is 34.

The square root of 647845 is about 804.8881909930. Note that the first 3 decimals coincide. The cubic root of 647845 is about 86.5280740175.

Subtracting from 647845 its reverse (548746), we obtain a palindrome (99099).

The spelling of 647845 in words is "six hundred forty-seven thousand, eight hundred forty-five".