684237816 has 24 divisors (see below), whose sum is σ = 1853144280. Its totient is φ = 228079248.

The previous prime is 684237779. The next prime is 684237817. The reversal of 684237816 is 618732486.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684237817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4751580 + ... + 4751723.

It is an arithmetic number, because the mean of its divisors is an integer number (77214345).

Almost surely, 2^684237816 is an apocalyptic number.

It is an amenable number.

684237816 is an abundant number, since it is smaller than the sum of its proper divisors (1168906464).

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

684237816 is a wasteful number, since it uses less digits than its factorization.

684237816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503315 (or 9503308 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 684237816 is about 26157.9398271347. The cubic root of 684237816 is about 881.1889129831.

The spelling of 684237816 in words is "six hundred eighty-four million, two hundred thirty-seven thousand, eight hundred sixteen".