684469818 has 16 divisors (see below), whose sum is σ = 1521044160. Its totient is φ = 228156588.

The previous prime is 684469787. The next prime is 684469823. The reversal of 684469818 is 818964486.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12675367 = 684469818 / (6 + 8 + 4 + 4 + 6 + 9 + 8 + 1 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6337630 + ... + 6337737.

It is an arithmetic number, because the mean of its divisors is an integer number (95065260).

Almost surely, 2^684469818 is an apocalyptic number.

684469818 is an abundant number, since it is smaller than the sum of its proper divisors (836574342).

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

684469818 is a wasteful number, since it uses less digits than its factorization.

684469818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12675378 (or 12675372 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 684469818 is about 26162.3740895202. The cubic root of 684469818 is about 881.2884955569.

The spelling of 684469818 in words is "six hundred eighty-four million, four hundred sixty-nine thousand, eight hundred eighteen".