679820520 has 64 divisors (see below), whose sum is σ = 2050920000. Its totient is φ = 180267008.

The previous prime is 679820503. The next prime is 679820563. The reversal of 679820520 is 25028976.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5656 + ... + 37304.

It is an arithmetic number, because the mean of its divisors is an integer number (32045625).

Almost surely, 2^679820520 is an apocalyptic number.

679820520 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 679820520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025460000).

679820520 is an abundant number, since it is smaller than the sum of its proper divisors (1371099480).

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

679820520 is a wasteful number, since it uses less digits than its factorization.

679820520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31842 (or 31838 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 679820520 is about 26073.3680217957. The cubic root of 679820520 is about 879.2885606641.

The spelling of 679820520 in words is "six hundred seventy-nine million, eight hundred twenty thousand, five hundred twenty".