647120 has 20 divisors (see below), whose sum is σ = 1504740. Its totient is φ = 258816.

The previous prime is 647117. The next prime is 647131. The reversal of 647120 is 21746.

It can be written as a sum of positive squares in 2 ways, for example, as 87616 + 559504 = 296^2 + 748^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 647092 and 647101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3965 + ... + 4124.

It is an arithmetic number, because the mean of its divisors is an integer number (75237).

2⁶⁴⁷¹²⁰ is an apocalyptic number.

It is an amenable number.

647120 is an abundant number, since it is smaller than the sum of its proper divisors (857620).

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

647120 is a wasteful number, since it uses less digits than its factorization.

647120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8102 (or 8096 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 647120 is about 804.4376918071. The cubic root of 647120 is about 86.4957842622.

Adding to 647120 its reverse (21746), we get a palindrome (668866).

It can be divided in two parts, 647 and 120, that added together give a palindrome (767).

The spelling of 647120 in words is "six hundred forty-seven thousand, one hundred twenty".