678571984 has 10 divisors (see below), whose sum is σ = 1314733250. Its totient is φ = 339285984.

The previous prime is 678571969. The next prime is 678571987. The reversal of 678571984 is 489175876.

It can be written as a sum of positive squares in only one way, i.e., 380250000 + 298321984 = 19500^2 + 17272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678571987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21205359 + ... + 21205390.

It is an arithmetic number, because the mean of its divisors is an integer number (131473325).

Almost surely, 2^678571984 is an apocalyptic number.

It is an amenable number.

678571984 is a deficient number, since it is larger than the sum of its proper divisors (636161266).

678571984 is a wasteful number, since it uses less digits than its factorization.

678571984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42410757 (or 42410751 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The square root of 678571984 is about 26049.4142736454. The cubic root of 678571984 is about 878.7499399782.

The spelling of 678571984 in words is "six hundred seventy-eight million, five hundred seventy-one thousand, nine hundred eighty-four".