678599424 has 144 divisors (see below), whose sum is σ = 2072125440. Its totient is φ = 218833920.

The previous prime is 678599423. The next prime is 678599437. The reversal of 678599424 is 424995876.

678599424 is a `hidden beast` number, since 6 + 7 + 8 + 599 + 42 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (678599423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212689 + ... + 215855.

It is an arithmetic number, because the mean of its divisors is an integer number (14389760).

Almost surely, 2^678599424 is an apocalyptic number.

678599424 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 678599424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036062720).

678599424 is an abundant number, since it is smaller than the sum of its proper divisors (1393526016).

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

678599424 is a wasteful number, since it uses less digits than its factorization.

678599424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223 (or 3203 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 678599424 is about 26049.9409596260. The cubic root of 678599424 is about 878.7617847413.

The spelling of 678599424 in words is "six hundred seventy-eight million, five hundred ninety-nine thousand, four hundred twenty-four".