647955 has 72 divisors (see below), whose sum is σ = 1493856. Its totient is φ = 253440.

The previous prime is 647953. The next prime is 647963. The reversal of 647955 is 559746.

647955 = 51² + 52² + ... + 127².

647955 is a `hidden beast` number, since 647 + 9 + 5 + 5 = 666.

647955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647955 - 2¹ = 647953 is a prime.

647955 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (647951) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 38107 + ... + 38123.

It is an arithmetic number, because the mean of its divisors is an integer number (20748).

2⁶⁴⁷⁹⁵⁵ is an apocalyptic number.

647955 is an abundant number, since it is smaller than the sum of its proper divisors (845901).

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

647955 is a wasteful number, since it uses less digits than its factorization.

647955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 43 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 647955 is about 804.9565205649. The cubic root of 647955 is about 86.5329710477.

Subtracting from 647955 its reverse (559746), we obtain a square (88209 = 297²).

It can be divided in two parts, 6 and 47955, that added together give a square (47961 = 219²).

The spelling of 647955 in words is "six hundred forty-seven thousand, nine hundred fifty-five".