684028 has 6 divisors (see below), whose sum is σ = 1197056. Its totient is φ = 342012.

The previous prime is 684017. The next prime is 684037. The reversal of 684028 is 820486.

It is a junction number, because it is equal to n+sod(n) for n = 683987 and 684005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85500 + ... + 85507.

2⁶⁸⁴⁰²⁸ is an apocalyptic number.

It is an amenable number.

684028 is a deficient number, since it is larger than the sum of its proper divisors (513028).

684028 is a wasteful number, since it uses less digits than its factorization.

684028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171011 (or 171009 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 684028 is about 827.0598527313. The cubic root of 684028 is about 88.1098833954.

It can be divided in two parts, 68 and 4028, that added together give a 12-th power (4096 = 2¹²).

The spelling of 684028 in words is "six hundred eighty-four thousand, twenty-eight".