684620 has 12 divisors (see below), whose sum is σ = 1437744. Its totient is φ = 273840.

The previous prime is 684617. The next prime is 684637. The reversal of 684620 is 26486.

It is a self number, because there is not a number n which added to its sum of digits gives 684620.

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, 17096 + ... + 17135.

It is an arithmetic number, because the mean of its divisors is an integer number (119812).

2⁶⁸⁴⁶²⁰ is an apocalyptic number.

It is an amenable number.

684620 is an abundant number, since it is smaller than the sum of its proper divisors (753124).

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

684620 is a wasteful number, since it uses less digits than its factorization.

684620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34240 (or 34238 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 684620 is about 827.4176696204. The cubic root of 684620 is about 88.1352946410.

The spelling of 684620 in words is "six hundred eighty-four thousand, six hundred twenty".