678489984 has 96 divisors (see below), whose sum is σ = 1958899800. Its totient is φ = 225414144.

The previous prime is 678489983. The next prime is 678490027. The reversal of 678489984 is 489984876.

678489984 is a `hidden beast` number, since 6 + 78 + 489 + 9 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678489983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428907 + ... + 430485.

Almost surely, 2^678489984 is an apocalyptic number.

678489984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678489984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979449900).

678489984 is an abundant number, since it is smaller than the sum of its proper divisors (1280409816).

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

678489984 is a wasteful number, since it uses less digits than its factorization.

678489984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1957 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The square root of 678489984 is about 26047.8402943507. The cubic root of 678489984 is about 878.7145419170.

The spelling of 678489984 in words is "six hundred seventy-eight million, four hundred eighty-nine thousand, nine hundred eighty-four".