671824 has 20 divisors (see below), whose sum is σ = 1314400. Its totient is φ = 332640.

The previous prime is 671791. The next prime is 671831. The reversal of 671824 is 428176.

It is a junction number, because it is equal to n+sod(n) for n = 671792 and 671801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079 + ... + 3289.

It is an arithmetic number, because the mean of its divisors is an integer number (65720).

2⁶⁷¹⁸²⁴ is an apocalyptic number.

It is an amenable number.

671824 is a deficient number, since it is larger than the sum of its proper divisors (642576).

671824 is a wasteful number, since it uses less digits than its factorization.

671824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 412 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 671824 is about 819.6487052390. The cubic root of 671824 is about 87.5827353506.

It can be divided in two parts, 67 and 1824, that added together give a triangular number (1891 = T₆₁).

The spelling of 671824 in words is "six hundred seventy-one thousand, eight hundred twenty-four".