684224080 has 20 divisors (see below), whose sum is σ = 1590821172. Its totient is φ = 273689600.

The previous prime is 684224077. The next prime is 684224087. The reversal of 684224080 is 80422486.

It can be written as a sum of positive squares in 2 ways, for example, as 536941584 + 147282496 = 23172^2 + 12136^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684224087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4276321 + ... + 4276480.

Almost surely, 2^684224080 is an apocalyptic number.

It is an amenable number.

684224080 is an abundant number, since it is smaller than the sum of its proper divisors (906597092).

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

684224080 is a wasteful number, since it uses less digits than its factorization.

684224080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552814 (or 8552808 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 684224080 is about 26157.6772669134. The cubic root of 684224080 is about 881.1830163530.

The spelling of 684224080 in words is "six hundred eighty-four million, two hundred twenty-four thousand, eighty".