684469820 has 24 divisors (see below), whose sum is σ = 1457634528. Its totient is φ = 269931200.

The previous prime is 684469787. The next prime is 684469823. The reversal of 684469820 is 28964486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684469823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239591 + ... + 242430.

It is an arithmetic number, because the mean of its divisors is an integer number (60734772).

Almost surely, 2^684469820 is an apocalyptic number.

It is an amenable number.

684469820 is an abundant number, since it is smaller than the sum of its proper divisors (773164708).

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

684469820 is a wasteful number, since it uses less digits than its factorization.

684469820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482101 (or 482099 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 684469820 is about 26162.3741277431. The cubic root of 684469820 is about 881.2884964153.

The spelling of 684469820 in words is "six hundred eighty-four million, four hundred sixty-nine thousand, eight hundred twenty".