684669620 has 12 divisors (see below), whose sum is σ = 1437806244. Its totient is φ = 273867840.

The previous prime is 684669581. The next prime is 684669641. The reversal of 684669620 is 26966486.

It can be written as a sum of positive squares in 2 ways, for example, as 84125584 + 600544036 = 9172^2 + 24506^2 .

It is a congruent number.

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, 17116721 + ... + 17116760.

It is an arithmetic number, because the mean of its divisors is an integer number (119817187).

Almost surely, 2^684669620 is an apocalyptic number.

It is an amenable number.

684669620 is an abundant number, since it is smaller than the sum of its proper divisors (753136624).

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

684669620 is a wasteful number, since it uses less digits than its factorization.

684669620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34233490 (or 34233488 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 684669620 is about 26166.1923099254. The cubic root of 684669620 is about 881.3742388426.

The spelling of 684669620 in words is "six hundred eighty-four million, six hundred sixty-nine thousand, six hundred twenty".