684261984 has 48 divisors (see below), whose sum is σ = 2052787968. Its totient is φ = 195503232.

The previous prime is 684261961. The next prime is 684262027. The reversal of 684261984 is 489162486.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508452 + ... + 509795.

It is an arithmetic number, because the mean of its divisors is an integer number (42766416).

Almost surely, 2^684261984 is an apocalyptic number.

It is an amenable number.

684261984 is an abundant number, since it is smaller than the sum of its proper divisors (1368525984).

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

684261984 is a wasteful number, since it uses less digits than its factorization.

684261984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018267 (or 1018259 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 684261984 is about 26158.4017860419. The cubic root of 684261984 is about 881.1992877010.

The spelling of 684261984 in words is "six hundred eighty-four million, two hundred sixty-one thousand, nine hundred eighty-four".