679919688 has 108 divisors (see below), whose sum is σ = 2146984515. Its totient is φ = 193820256.

The previous prime is 679919677. The next prime is 679919689. The reversal of 679919688 is 886919976.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 339959844 + 339959844 = 18438^2 + 18438^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18438.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (679919689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1548573 + ... + 1549011.

Almost surely, 2^679919688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 679919688

679919688 is an abundant number, since it is smaller than the sum of its proper divisors (1467064827).

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

679919688 is a wasteful number, since it uses less digits than its factorization.

679919688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 451 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 679919688 is about 26075.2696630351. The cubic root of 679919688 is about 879.3313136388.

The spelling of 679919688 in words is "six hundred seventy-nine million, nine hundred nineteen thousand, six hundred eighty-eight".