679947840 has 504 divisors, whose sum is σ = 2784457728. Its totient is φ = 150958080.

The previous prime is 679947811. The next prime is 679947841. The reversal of 679947840 is 48749976.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (679947841) 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 71 ways as a sum of consecutive naturals, for example, 5353857 + ... + 5353983.

Almost surely, 2^679947840 is an apocalyptic number.

679947840 is a gapful number since it is divisible by the number (60) 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 679947840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1392228864).

679947840 is an abundant number, since it is smaller than the sum of its proper divisors (2104509888).

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

679947840 is a wasteful number, since it uses less digits than its factorization.

679947840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 679947840 is about 26075.8094792856. The cubic root of 679947840 is about 879.3434496768.

The spelling of 679947840 in words is "six hundred seventy-nine million, nine hundred forty-seven thousand, eight hundred forty".