647244 has 48 divisors (see below), whose sum is σ = 1811040. Its totient is φ = 198720.

The previous prime is 647219. The next prime is 647261. The reversal of 647244 is 442746.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647244.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1174 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (37730).

2⁶⁴⁷²⁴⁴ 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 647244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905520).

647244 is an abundant number, since it is smaller than the sum of its proper divisors (1163796).

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

647244 is a wasteful number, since it uses less digits than its factorization.

647244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 479 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 647244 is about 804.5147605855. The cubic root of 647244 is about 86.5013086329.

The spelling of 647244 in words is "six hundred forty-seven thousand, two hundred forty-four".