684408028 has 6 divisors (see below), whose sum is σ = 1197714056. Its totient is φ = 342204012.

The previous prime is 684408019. The next prime is 684408029. The reversal of 684408028 is 820804486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684408029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85551000 + ... + 85551007.

Almost surely, 2^684408028 is an apocalyptic number.

It is an amenable number.

684408028 is a deficient number, since it is larger than the sum of its proper divisors (513306028).

684408028 is a wasteful number, since it uses less digits than its factorization.

684408028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171102011 (or 171102009 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 684408028 is about 26161.1931685082. The cubic root of 684408028 is about 881.2619755394.

The spelling of 684408028 in words is "six hundred eighty-four million, four hundred eight thousand, twenty-eight".