669824 has 16 divisors (see below), whose sum is σ = 1334670. Its totient is φ = 334848.

The previous prime is 669791. The next prime is 669839. The reversal of 669824 is 428966.

It can be written as a sum of positive squares in only one way, i.e., 399424 + 270400 = 632^2 + 520^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669824.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489 + ... + 2744.

2⁶⁶⁹⁸²⁴ is an apocalyptic number.

669824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

669824 is a deficient number, since it is larger than the sum of its proper divisors (664846).

669824 is an equidigital number, since it uses as much as digits as its factorization.

669824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5247 (or 5235 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 669824 is about 818.4277610150. The cubic root of 669824 is about 87.4957385680.

The spelling of 669824 in words is "six hundred sixty-nine thousand, eight hundred twenty-four".