684681084 has 18 divisors (see below), whose sum is σ = 1730721720. Its totient is φ = 228227016.

The previous prime is 684681077. The next prime is 684681091. The reversal of 684681084 is 480186486.

It is an interprime number because it is at equal distance from previous prime (684681077) and next prime (684681091).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9509424 + ... + 9509495.

Almost surely, 2^684681084 is an apocalyptic number.

It is an amenable number.

684681084 is an abundant number, since it is smaller than the sum of its proper divisors (1046040636).

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

684681084 is a wasteful number, since it uses less digits than its factorization.

684681084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19018929 (or 19018924 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 684681084 is about 26166.4113703045. The cubic root of 684681084 is about 881.3791580122.

The spelling of 684681084 in words is "six hundred eighty-four million, six hundred eighty-one thousand, eighty-four".