679842720 has 120 divisors (see below), whose sum is σ = 2399324004. Its totient is φ = 181287936.

The previous prime is 679842707. The next prime is 679842727. The reversal of 679842720 is 27248976.

It can be written as a sum of positive squares in 2 ways, for example, as 618815376 + 61027344 = 24876^2 + 7812^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×679842720² = 924372247873996800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (679842727) 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 19 ways as a sum of consecutive naturals, for example, 13269 + ... + 39188.

Almost surely, 2^679842720 is an apocalyptic number.

679842720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

679842720 is an abundant number, since it is smaller than the sum of its proper divisors (1719481284).

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

679842720 is a wasteful number, since it uses less digits than its factorization.

679842720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52484 (or 52467 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 679842720 is about 26073.7937400755. The cubic root of 679842720 is about 879.2981318146.

The spelling of 679842720 in words is "six hundred seventy-nine million, eight hundred forty-two thousand, seven hundred twenty".