647164 has 24 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 267456.

The previous prime is 647161. The next prime is 647189. The reversal of 647164 is 461746.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (55860).

2⁶⁴⁷¹⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670320).

647164 is an abundant number, since it is smaller than the sum of its proper divisors (693476).

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

647164 is a wasteful number, since it uses less digits than its factorization.

647164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 835 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 647164 is about 804.4650396381. The cubic root of 647164 is about 86.4977446036.

The spelling of 647164 in words is "six hundred forty-seven thousand, one hundred sixty-four".