678981984 has 48 divisors (see below), whose sum is σ = 1786498560. Its totient is φ = 225797760.

The previous prime is 678981977. The next prime is 678981991. The reversal of 678981984 is 489189876.

It is an interprime number because it is at equal distance from previous prime (678981977) and next prime (678981991).

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

It is a super-2 number, since 2×678981984² = 922033069193152512, which contains 22 as substring.

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, 34089 + ... + 50199.

It is an arithmetic number, because the mean of its divisors is an integer number (37218720).

Almost surely, 2^678981984 is an apocalyptic number.

It is an amenable number.

678981984 is an abundant number, since it is smaller than the sum of its proper divisors (1107516576).

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

678981984 is a wasteful number, since it uses less digits than its factorization.

678981984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563 (or 16555 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 60.

The square root of 678981984 is about 26057.2827439854. The cubic root of 678981984 is about 878.9268875215.

The spelling of 678981984 in words is "six hundred seventy-eight million, nine hundred eighty-one thousand, nine hundred eighty-four".