684149818 has 8 divisors (see below), whose sum is σ = 1119517920. Its totient is φ = 310977180.

The previous prime is 684149803. The next prime is 684149849. The reversal of 684149818 is 818941486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15548838 + ... + 15548881.

It is an arithmetic number, because the mean of its divisors is an integer number (139939740).

Almost surely, 2^684149818 is an apocalyptic number.

684149818 is a deficient number, since it is larger than the sum of its proper divisors (435368102).

684149818 is a wasteful number, since it uses less digits than its factorization.

684149818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31097732.

The product of its digits is 442368, while the sum is 49.

The square root of 684149818 is about 26156.2577216237. The cubic root of 684149818 is about 881.1511355785.

The spelling of 684149818 in words is "six hundred eighty-four million, one hundred forty-nine thousand, eight hundred eighteen".