647824 has 20 divisors (see below), whose sum is σ = 1321840. Its totient is φ = 306720.

The previous prime is 647821. The next prime is 647837. The reversal of 647824 is 428746.

It is not an unprimeable number, because it can be changed into a prime (647821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (66092).

2⁶⁴⁷⁸²⁴ is an apocalyptic number.

It is an amenable number.

647824 is an abundant number, since it is smaller than the sum of its proper divisors (674016).

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

647824 is a wasteful number, since it uses less digits than its factorization.

647824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2152 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 647824 is about 804.8751455971. The cubic root of 647824 is about 86.5271390669.

The spelling of 647824 in words is "six hundred forty-seven thousand, eight hundred twenty-four".