645824 has 14 divisors (see below), whose sum is σ = 1281684. Its totient is φ = 322880.

The previous prime is 645803. The next prime is 645833. The reversal of 645824 is 428546.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982 + ... + 5109.

2⁶⁴⁵⁸²⁴ is an apocalyptic number.

645824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645824 is a deficient number, since it is larger than the sum of its proper divisors (635860).

645824 is a wasteful number, since it uses less digits than its factorization.

645824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10103 (or 10093 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 645824 is about 803.6317564656. The cubic root of 645824 is about 86.4380034005.

The spelling of 645824 in words is "six hundred forty-five thousand, eight hundred twenty-four".